$$\text{Number of neutrons} = \text{Atomic weight} - \text{Number of protons}$$

Question 1

Which of the following best describes an isotope?

Accepted Answer

An atom with a different number of neutrons than other atoms of the same element

Question 2

If a sodium atom ($$\mathrm{Na}) $$loses one electron, what is its resulting charge?

Accepted Answer

$$+1$$

Question 3

Which subatomic particle determines the atomic number of an element?

Accepted Answer

Proton

Question 4

A carbon atom has 6 protons and 8 neutrons. What is its atomic mass?

Accepted Answer

$$14$$

Question 5

Which term describes a pure substance made of only one kind of atom?

Accepted Answer

Element

Question 6

What is the process called when sodium (Na) and chlorine (Cl) combine to form table salt (NaCl)?

Accepted Answer

Chemical reaction

Question 7

Which part of the atom contains both protons and neutrons?

Accepted Answer

Nucleus

Question 8

What is the charge of an ion formed when an atom gains an electron?

Accepted Answer

Negative

Question 9

Which of the following best explains why isotopes of the same element behave similarly in chemical reactions?

Accepted Answer

They have the same number of electrons in their outer shell

Question 10

Which vocabulary word best describes the region around the nucleus where electrons are found?

Accepted Answer

Electron cloud

Question 11

A PET scan uses radioactive isotopes. What property of isotopes makes them useful for medical imaging?

Accepted Answer

They emit radiation due to unstable nuclei

Question 12

Which of the following is the correct formula for calculating the number of neutrons in an atom?

Accepted Answer

$$	ext{Number of neutrons} = 	ext{Atomic weight} - 	ext{Number of protons}$$

Question 13

Which of the following is NOT a subatomic particle?

Accepted Answer

Compound

Question 14

What is the total number of protons and neutrons in the nucleus of an atom called?

Accepted Answer

Atomic weight (mass number)

Question 15

Which of the following best describes a compound?

Accepted Answer

A substance made of two or more elements chemically combined

Question 16

During photosynthesis, which vocabulary word best describes the transformation of carbon dioxide and water into glucose?

Accepted Answer

Chemical reaction

Question 17

Which of the following is the correct symbol for an element with atomic number 6?

Accepted Answer

C

Question 18

If an atom has 11 protons, 12 neutrons, and 10 electrons, what is its net charge?

Accepted Answer

$$+1$$

Question 19

Which of the following best describes matter?

Accepted Answer

Anything that has mass and takes up space

Question 20

Which process changes one set of substances into another?

Accepted Answer

Chemical reaction

Chemistry of Life: Atomic Structure and Elements Study Guide

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