4.2

Question 1

that attracts any object with mass. Every object, including you, is pulling on every other object in the entire universe! This is called Newton’s Universal Law of Gravitation.

Answer 1

gravitational force

Question 2

) is one of the four known fundamental interactions of nature, alongside the strong interaction, electromagnetism, and gravitation.

Answer 2

weak force

Question 3

inds quarks together in clusters to make more-familiar subatomic particles, such as protons and neutrons. It also holds together the atomic nucleus and underlies interactions between all particles containing quarks

Answer 3

strong force

Question 4

is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles.

Answer 4

electromagnetic force

Question 5

the mass of an atom

Answer 5

atomic mass

Question 6

unit of mass that describes the mass of an atom or molicule

Answer 6

atomic mass unit

Question 7

number of protons in the nucleus of an atom

Answer 7

atomic number

Question 8

positively charged particles

Answer 8

protron

Question 9

negatively charged particles

Answer 9

nucleus

Question 10

subatomic particle with no charge

Answer 10

nutron

Question 11

sum of the numbers of protons and neutrons

Answer 11

mass number

Question 12

an atom that has the same number of protons

Answer 12

istopes