May someone help me with the answer to this question I’ve been stuck on it

We know that any known element is defined by the number of protons in its nucleus (which is the same as the number of orbiting electrons).

We can define isotopes as the atoms of the same element but that have a different number of neutrons in the nucleus. The correct statement of the difference between stable isotopes and unstable isotopes is:

"The difference between a stable isotope and an unstable isotope of an element is that the unstable isotope has a nucleus that decays spontaneously, is radioactive, and can be transformed into an atom of another element"

Particularly we can define two of these, the stable isotopes, that can remain as they are for a lot of time, and the unstable isotopes, that have more neutrons in its nucleus than a stable isotope, and because having those extra neutrons in the nucleus needs energy, eventually the isotope will experience a spontaneous radioactive decay, which "breaks" the nucleus in different ways, and, in some cases, generates different elements in the process.

Then we can conclude that:

"The difference between a stable isotope and an unstable isotope of an element is that the unstable isotope has a nucleus that decays spontaneously, is radioactive, and can be transformed into an atom of another element"

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Density is the measure of a mass per unit volume of a material substance

density= Mass/volume

The unit of density is g/cm^3

Answer:

C

Explanation:

alkali metals are the Group I elements, which have 1 electron in their valence shells

Answer:

Alkali metals are the elements which have only one valence electron in their outermost or ultimate shell.

Explanation:

Alkaline Earth metals have 2 valence electron in their outermost shell and readily give up their 2 electron to achieve stability.

Rare Earth Metals have 3 valence electron in their outermost shell and they have high magnetic moments and divert range of magnetic structure.

Alkali Earth metals have 1 valence electron.

Transition metals generally have 2 valence electron .

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[tex] \huge \boxed{\mathfrak{Formulas} \downarrow}[/tex]

[tex] \large \sf \: mole = \frac{mass}{molar \: mass} \\ [/tex]

[tex]\large \sf \:mole = \frac{volume}{molar \: volume} \\ [/tex]

[tex]\large \sf \:concentration \: ( \frac{g}{ {dm}^{3} } ) \\\large \sf \: = \frac{mass(g)}{volume( {dm}^{3} )} [/tex]

Comparing the data obtained online, the first group is more precise

The reason the above selection is correct is as follows;

Question: Parts of the question appear missing from a similar question online and included here;

First Group:

[tex]\begin{array}{|c|c|c|c|c|c|c|} Team \ a &Team \ b&Team \ c&Team \ d&Team \ e&Team \ f&Team \ g\\2.77 \ cm&2.60 \ cm&2.80 \ cm&2.65 \ cm&2.75 \ cm&2.65 \ cm& 2.68 \ cm\end{array}\right][/tex]

Second Group

[tex]\begin{array}{|c|c|c|c|c|c|c|} Team \ a &Team \ b&Team \ c&Team \ d&Team \ e&Team \ f&Team \ g\\2.70 \ cm&2.78 \ cm&2.62 \ cm&2.65 \ cm&2.75 \ cm&2.80 \ cm& 2.60 \ cm\end{array}\right][/tex]

Calculations for the first group:

The average = (2.77 + 2.60 + 2.80 + 2.65 + 2.75 + 2.65 + 2.68)/7 = 2.7

The range = 2.80 - 2.60 = 0.20

The approximate ± range of the average = ±0.2/2 = ±0.1

The precision of the first measurement is 2.7 ± 0.1 cm

Calculations for the second group:

The average = (2.70 + 2.78 + 2.62 + 2.65 + 2.75 + 2.80 + 2.60)/7 = 2.7

The range = 2.80 - 2.60 = 0.20

The approximate ± range from the average = ±0.2/2 = ±0.1

The range of values from the average is approximately ±0.1 cm

The precision of the first measurement is 2.7 ± 0.1 cm

Method to determine precision:

Precision is given by the finding the average deviation and the standard deviation as follows;

[tex]\mathbf{Average \ deviation} = \dfrac{\sum \left | x - \mu \right |}{n}[/tex]

[tex]\mathbf{Standard\ deviation} =\sqrt{\dfrac{\sum \left ( x - \mu \right )^2}{n}}[/tex]

Where;

μ = The mean or average = 2.7

n = The number of items (count) of the data = 7

For the first group, we have;

[tex]\mathbf{\dfrac{\sum \left | x - \mu \right |}{n}} = \dfrac{0.07 + 0.1 + 0.1 + 0.05 + 0.05 + 0.05 + 0.02 }{7} = \mathbf{0.062857}[/tex]

The average deviation of the first group = 0.062857

∑(x - μ)² ≈ 0.0328

[tex]\mathbf{The \ standard\ deviation} =\sqrt{\dfrac{0.0328}{7}} \approx \mathbf{0.068452}[/tex]

For the second group, we have;

[tex]\mathbf{\dfrac{\sum \left | x - \mu \right |}{n}} = \dfrac{0.0+ 0.08 + 0.08 + 0.05 + 0.05 + 0.1 + 0.1 }{7} = \mathbf{0.06571428571}[/tex]

∑(x - μ)² ≈ 0.0378

[tex]\mathbf{The \ standard\ deviation} =\sqrt{\dfrac{0.0378}{7}} \approx \mathbf{0.073485}[/tex]

By using the average deviation, and standard deviation values, the deviation of the second group is more than the first group and therefore the first group is more precise

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Answer:

A. > digestive and circulation

B. > digestive and excertory

C. > nervous and muscluar

D.> digestive and circulation

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Explanation:

aluminium belongs to group 13 and period 3

Answer:

0 degrees Celcius and 32 degrees fahrenheit

Explanation:

Answer:

This law is not applicable or not helpful in the conversion of diamond to graphite because both are just allotropes of carbon along with C60 (Buckminsterfullerene or buckyball), C540, C70, amorphous carbon, and carbon nanotube

Explanation: did that help? hope it did!

Explanation:

The goats can stretch their necks up to 7 feet, biting branches and low lying leaves. They eat poison oak and can clear rocky cliffs -- something other livestock can't do. And it's easier to control where the goats cut a fire break, unlike controlled burns -- another method of removing wildfire fuel.

The change from graphite to diamond is a chemical change.

A chemical change involves the rearrangement of atoms in a substance. In other words, the "composition" of the substance changes when a chemical change takes place.

This is clearly seen when graphite changes to diamond. The arrangement of carbon atoms changes as reflected by the change in the density of graphite when it is converted to diamond.

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Answer:

C. Amount of 3 dimensional space the object occupies

Explanation:

Single dimension is a laminar

Amount of 2 dimension is area

Amount of 4 dimension is negligible

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Answer C. Amount of 3 dimensional space the object occupies 

Explanation:

 Single dimension is a laminarAmount of 2 dimension is areaAmount of 4 dimension is negligible

Answer:

3 exothermic reaction. only that much

Hi,

These are the answers.

• Question 2. C , Substance dissolves

• Question 3. D , Exothermic reaction

• Question 4. C , Endothermic reaction takes place

• Question 5. A , the products formed has more energy than reactants

Hope it helps you... pls mark brainliest if it helped you

Answer:

2jd

Explanation:

Heueneirnfjgnjfbgjgfj,fqiywyjeukdhsjdshmsjhskdlhkddvndkurmbsjhsmjdjgsjlsmhudksyke

answer

When an electron temporarily occupies an energy state greater than its ground state, it is in an excited state. An electron can become excited if it is given extra energy, such as if it absorbs a photon, or packet of light, or collides with a nearby atom or particle

Answer:

Substance that are used in the reaction

Explanation:

I hope this will help you

Answer:

Substances that are used in the reaction. Hope my answer helps you!

Answer:

"The polar regions have long winters and short, cool summers."

Explanation:

Climate is the average of that weather. The climate record also includes extreme values such as record high temperatures or record amounts of rainfall.

For Climate example:

You can expect snow in the Northeast in January or for it to be hot and humid in the Southeast in July.

Answer:

The excretory system removes waste from the body. remove waste from the blood. The digestive system breaks down the food you eat into nutrients that provide energy and building materials for cells. The digestive and excretory sytems work together to process the food that you eat.

Answer: B, C, E, D, A, F

Explanation: It is a little difficult to assign a regid order to these statements. Much depends on one's definition of "more scientific." My thoughts:

B: Only in the movies

C: Flat Earthers still exist, but no one has ever fallen off the edge, that I'm aware of

E: I've had a few pets with souls. My cat has it in for me.

D: I met Linus Pauling twice - he was too enthusiastic with his vitamin C and did not critically evaluate the evidence, but he was far more correct than the Flat-Earthers.

A: Lots of good evidence, although it can also depend on the definition of "living," Is a virus "living?"

F: Yep, I've done it myself. Heavier object have more inertia - they are the couch potatoes of physics. They will take their own time to get moving.

Answer:  At some point in your chemistry education, you may have been introduced to the song “The Elements in which Tom Lehrer does a rapid

fire musical rendition of all the elements' names. Like me, you may even have been offered the opportunity to memorize this song for extra credit. If so, it’s possible that you still remember the names of all the elements, which is an impressive feat—not to mention a fun trick to pull out at parties.

Explanation:

Answer:

23.7

Explanation:

The formula to convert from L to dL is:

dL = L x 10

Solid Lead II carbonate can not conduct electricity because it is insoluble in water.

First of all, we must establish the fact that ionic solids conduct electricity in solution because they can be broken up into ions in solution.

In the solid state, they do not conduct electricity because the ions are strongly bound by electrostatic forces.

However, if an ionic substance is insoluble in water, its ions are not available to conduct electricity since ions are the charge carrier in solution. As a result of this, such a substance will not conduct electricity.

Since Lead II carbonate is insoluble in water, its ions are not available hence the substance does not conduct electricity.

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Answer: B, the gas is being squeezed out of the liquid.

Explanation: The gas does not want to be trapped inside of the liquid, so it is trying to force it’s way out. Therefore creating more pressure in the container or whatever the liquid is being held in.

Answer: more gas dissolves into the liquid

Explanation: just got it wrong thats the right answer

Explanation:

The main difference between Mendeleev and Modern period table is that Mendeleev's periodic table orders the elements based on their atomic mass whereas Modern periodic table orders the elements based on their atomic number.

Mendeleev's periodic law states that the physical and chemical properties of the elements are a periodic function of their atomic weights while Modern periodic law states that physical and chemical properties of elements are a periodic function of their numbers.

Answer:

B

Explanation:

Protons have a positive charge while neutrons have no charge because they are neutral.

Answer:

b

Explanation:

b/ce protons have+ charge while neutrons have no charge

The control group are the students who eat no breakfast. The independent variable is the consumption of breakfast. The dependent variable is the performance of students in school.

In an experiment, the control group is the group that did not receive the treatment. The treatment in this case is the consumption of breakfast. Hence the group that did not consume breakfast is the control group.

The independent variable is the variable that is being manipulated and its effect evaluated. The manipulated variable here is consumption of food.

The dependent variable is the variable that is being measured. In this case, it is the performance of students at school.

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Explanation:

idea= hypothesis

xperience in nature= read Darwin's theory..

with birds from Galapagos island or rain forest environment., had proven that the shape of a bird's beaks, determined what their diet consisted of In the wild.

captured birds from such countries, has proven, an omnivore or seed eater...through testing plus dissection.