Question 1

Given the representations of nuclei A through E, which pair of nuclei are isotopes of the same element?

Accepted Answer

A and E

Question 2

If nucleus A contains 3 protons and 4 neutrons, what is its atomic symbol?

Accepted Answer

$$\mathrm{^7_3Li}$$

Question 3

Which of the following best describes the element represented by nucleus C if it has 11 protons?

Accepted Answer

Metal

Question 4

If nucleus D has 19 protons and 20 neutrons, what is its atomic symbol?

Accepted Answer

$$\mathrm{^{39}_{19}K}$$

Question 5

Which sphere (A–D) most likely represents the atom of rubidium (Rb)?

Accepted Answer

B

Question 6

If sphere D is the smallest, which element does it most likely represent?

Accepted Answer

Lithium (Li)

Question 7

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 8

If nucleus E has 3 protons and 3 neutrons, what is its atomic symbol and is it an isotope of nucleus A?

Accepted Answer

$$\mathrm{^6_3Li}$$; Yes, they are isotopes

Question 9

Which element among Li, Na, K, and Rb has the largest atomic radius?

Accepted Answer

Rubidium (Rb)

Question 10

A patient is found to have an abnormal ratio of neutrons to protons in sodium atoms. Which property of sodium is most likely affected?

Accepted Answer

Its mass number

Question 11

Which of the following is true about the elements represented by nuclei A through E in problem 4.85?

Accepted Answer

All are metals

Question 12

If sphere C is larger than sphere A but smaller than sphere B, which element does sphere C most likely represent?

Accepted Answer

Potassium (K)

Question 13

Which of the following best explains why isotopes of the same element have similar chemical properties?

Accepted Answer

They have the same number of protons and electrons.

Question 14

A nucleus has 11 protons and 12 neutrons. What is its atomic symbol?

Accepted Answer

$$\mathrm{^{23}_{11}Na}$$

Question 15

Which of the following elements is classified as a metalloid?

Accepted Answer

None of the above

Question 16

If an atom has 19 protons, what is its atomic number and which element does it represent?

Accepted Answer

Atomic number 19; Potassium (K)

Question 17

Which of the following would be the correct atomic symbol for an isotope of lithium with 3 protons and 3 neutrons?

Accepted Answer

$$\mathrm{^6_3Li}$$

Question 18

If sphere A is smaller than sphere C, which element does sphere A most likely represent?

Accepted Answer

Lithium (Li)

Question 19

Which of the following statements is true regarding the periodic trend in atomic radius for Li, Na, K, and Rb?

Accepted Answer

Atomic radius increases as you move down the group.

Question 20

A nucleus contains 3 protons and 4 neutrons. What is its mass number?

Accepted Answer

$$7$$

Atomic Structure, Isotopes, and Periodic Trends: Study Notes

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