$$\text{Atomic mass} = \text{Number of protons} + \text{Number of neutrons}$$

Question 1

Which of the following best describes the atomic number of an element?

Accepted Answer

The number of protons in the nucleus

Question 2

A neutral atom of carbon has an atomic number of 6 and an atomic mass of 12. How many neutrons does it have?

Accepted Answer

$$6$$

Question 3

Which of the following is the correct formula for calculating the atomic mass of an atom?

Accepted Answer

$$	ext{Atomic mass} = 	ext{Number of protons} + 	ext{Number of neutrons}$$

Question 4

A silver atom (Ag) has an atomic number of 47 and an atomic mass of 107.8682. How many neutrons does a typical silver atom have?

Accepted Answer

$$60$$

Question 5

Which of the following statements about atoms is TRUE?

Accepted Answer

Atoms are neutral because the number of protons equals the number of electrons

Question 6

Which subatomic particle is responsible for the chemical properties of an element?

Accepted Answer

Electrons

Question 7

If an atom has 17 protons, 18 neutrons, and 17 electrons, what is its atomic mass?

Accepted Answer

$$35$$

Question 8

Which of the following is considered the basic 'unit' of life?

Accepted Answer

Cells

Question 9

Which element has an atomic number of 30?

Accepted Answer

Zinc

Question 10

A helium atom has an atomic number of 2 and an atomic mass of 4. How many neutrons does it have?

Accepted Answer

$$2$$

Question 11

Which of the following best explains why noble gases are chemically inert?

Accepted Answer

They have a full outer electron shell

Question 12

Which diagram best represents Bohr’s model of an atom?

Accepted Answer

Electrons orbiting the nucleus in defined energy levels

Question 13

Which of the following is NOT a subatomic particle found in atoms?

Accepted Answer

Molecule

Question 14

If the atomic number of tungsten (W) is 74 and its atomic mass is 183.84, how many neutrons does a typical tungsten atom have?

Accepted Answer

$$109$$

Question 15

Which of the following is the correct definition of a molecule?

Accepted Answer

A group of atoms bonded together

Question 16

Which of the following is TRUE about the mass of electrons compared to protons and neutrons?

Accepted Answer

Electrons have negligible mass compared to protons and neutrons

Question 17

Which of the following is the correct chemical symbol for helium?

Accepted Answer

He

Question 18

Which of the following best describes the relationship between atoms and molecules?

Accepted Answer

Molecules are made of atoms bonded together

Question 19

Which of the following is a real-world example of a compound?

Accepted Answer

Water ($$H_2O)$$

Question 20

If an atom has 10 protons, 10 neutrons, and 10 electrons, what is its atomic number and atomic mass?

Accepted Answer

Atomic number: $$10$$, Atomic mass: $$20$$

Atoms, Molecules, and the Basis of Life: Study Notes for General Biology

Study Guide - Practice Questions