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AnnyKZ [126]
3 years ago
8

How do you figure out the number of protons, neutrons, and electrons in each of these isotopes? a. 6/3 Li, 7/3 Li b. 42/20 Ca, 4

4/20 Ca c. 78/34Se,
Chemistry
1 answer:
liq [111]3 years ago
3 0
So # of protons is always going to just be the atomic number, which if you look on a periodic table, its the big one in the corner. So you can look that up easy for Li, Ca, and Se. 

The numbers tell you the atomic mass over the atomic number. 

Since the two particles that give an atom mass (neutrons and protons) both have a mass of about 1 amu, the atomic mass is essentially # of neutrons + number of protons. 

So # of neutrons = atomic mass - number of protons. 

The number of electrons is the same as the number of protons unless the atom is actually an ion. 

If so, then if you had something like Li, it would have 3 electrons (same as # of protons). But if you had Li+, it would only have two. The plus shows that you lost one negative charge (one electron), hence why you have 2. <span />
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What is the density (g/mL) of an object that has a mass of 0.03 kg and occupies a volume of 25 mL?
tatyana61 [14]
First convert the kg to g ----- 0.03kg = 30g
Then divide the mass by the volume ----- 30g ÷ 25mL = 1.2
The density is 1.2g/mL<span />
5 0
3 years ago
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Is carbon a metal or a nonmetal? How many valence electrons does a carbon atom have?
marshall27 [118]

Answer:

Carbon is a solid non-metal element. Carbon has eight valence electrons.

Explanation:

hope this helps!

7 0
3 years ago
Sodium has an atomic number of 11 and has a net charge of 0. When sodium combines with chlorine, it has a net charge of +1. Why?
Mamont248 [21]

Answer: Option (A) is the correct answer.

Explanation:

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Thus, we can conclude that when sodium combines with chlorine, it has a net charge of +1 because sodium loses a negative electron when forming chemical bonds.

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Which provides evidence to support the big bang theory?
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A<span>. </span>
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6 0
2 years ago
The chart shows information gathered as part of the problem-solving process.
vesna_86 [32]

From the information obtained by the problem-solving process, around 11 percentage of the school students need to have special diets.Hence, Option (C) i.e, 11 % is corrrect

<h3>What is problem-solving?</h3>

Identification of problems and marking out the steps and methods to solve them is regarded as problem-solving.

Problems can be identified only after attainment of information.

To be able to solve the problems of students suffering from a balanced diet, one out of every ten students need to include special diets in regular course.

Hence, option C holds true of the problem-solving process.

Therefore, Option (C) i.e, 11 % is corrrect

Learn more about problem-solving here ;

brainly.com/question/3418829

#SPJ1

3 0
2 years ago
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