Question 1

Which subatomic particle is responsible for the chemical identity of an element, and how is this reflected in the periodic table?

Accepted Answer

The number of protons; reflected as the atomic number

Question 2

A neutral atom of sodium (Na) has an atomic number of 11. How many electrons does it have?

Accepted Answer

11

Question 3

Which of the following best describes the difference between a physical change and a chemical reaction?

Accepted Answer

A physical change does not alter the identity of a substance, while a chemical reaction produces new substances by rearranging atoms.

Question 4

Which of the following formulas represents a polyatomic element?

Accepted Answer

S8

Question 5

What is the net charge on an ion with 17 protons and 18 electrons?

Accepted Answer

$$-1$$

Question 6

Which of the following is a correct isotope symbol and name for an atom with 17 protons and 20 neutrons?

Accepted Answer

$$^{37}\mathrm{Cl}$$, chlorine-37

Question 7

Which of the following elements is a metalloid?

Accepted Answer

Silicon (Si)

Question 8

A sample of chlorine contains 75% $$^{35}\mathrm{Cl} ($$mass = 35.0 amu) and 25% $$^{37}\mathrm{Cl} ($$mass = 37.0 amu). What is the atomic mass of chlorine?

Accepted Answer

$$35.5$$ amu

Question 9

Which of the following lists contains only nonmetals?

Accepted Answer

H, I, He, P, C

Question 10

Which group in the periodic table is known as the noble gases?

Accepted Answer

Group 8A

Question 11

What is the charge of an oxygen ion when it forms a single ion?

Accepted Answer

$$-2$$

Question 12

Which of the following best describes a nuclear reaction?

Accepted Answer

A process that changes the number of protons or neutrons in a nucleus

Question 13

Which of the following is a diatomic element in its elemental state?

Accepted Answer

H2

Question 14

Which of the following statements about metals is FALSE?

Accepted Answer

Metals are found to the right of the metalloids on the periodic table.

Question 15

Which of the following is a compound?

Accepted Answer

NaCl

Question 16

If an atom has 15 protons, 16 neutrons, and 18 electrons, what is its net charge?

Accepted Answer

$$-3$$

Question 17

Which of the following is a correct description of isotopes?

Accepted Answer

Atoms with the same number of protons but different numbers of neutrons

Question 18

Which family does cesium (Cs) belong to?

Accepted Answer

Alkali metals

Question 19

Which of the following best explains why the periodic table is arranged in its current shape?

Accepted Answer

To group elements with similar chemical properties in the same columns

Question 20

Which of the following is a real-world example of a nuclear reaction?

Accepted Answer

Fusion of hydrogen atoms to form helium in the sun

Atoms, Ions, and Periodicity: Foundations for General Biology

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