4.2 The Atom

Question 1

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

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

the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an elements

Answer 4

atomic number

Question 5

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

Answer 5

isotope

Question 6

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

Answer 6

mass number

Question 7

the mass of an atom expressed in atomic mass units

Answer 7

atomic mass

Question 8

acts between all the time

Answer 8

Gravitational Force

Question 9

attracted each other because they have opposite charges

Answer 9

Electromagnetic Force

Question 10

Protons push away from one another because of the electromagnetic force

Answer 10

Strong Force

Question 11

is an important force in radioactive atoms

Answer 11

Weak Force