Section 4

Question 1

the smallest unit of an element that maintains the properties of that element

Answer 1

atom

Question 2

a subatomic particle that has a negative charge

Answer 2

electron

Question 3

in physical science, an atom’s central region, which is made up of protons and neutrons

Answer 3

nucleus

Question 4

a region around the nucleus of an atom where electrons are likely to be found

Answer 4

electron cloud

Question 5

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

Answer 5

proton

Question 6

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

Answer 6

atomic mass unit

Question 7

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

Answer 7

neutron

Question 8

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

Answer 8

atomic number

Question 9

an atom that has the same number of protons as other atoms of the same element but a different number of neutrons

Answer 9

isotope

Question 10

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

Answer 10

mass number

Question 11

the mass of a number expressed in atomic mass units

Answer 11

atomic mass