4.2 The Atom

Question 1

a subatomic particle that has a positive charge and that is found in the nucleus

Answer 1

proton

Question 2

a unit of mass that describes the mass of an atom or molecule

Answer 2

atomic mass unit

Question 3

a subatomic particle that has no charge and that is found in the nucleus of an atom

Answer 3

neutron

Question 4

when an atom becomes a charged

Answer 4

ion

Question 5

the number of an atom; the atomic number is the same for all atoms of an element

Answer 5

atomic number

Question 6

an atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)

Answer 6

isotope

Question 7

unstable atom is an atom with a nucleus that will change change over time

Answer 7

radioactive

Question 8

the sum of the numbers of protons and neutrons in the nucleus of an atom

Answer 8

mass number

Question 9

the mass of an atom expressed in atomic mass units

Answer 9

atomic mass

Question 10

the pushes and pulls between objects

Answer 10

forces