atoms

Question 1

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

Answer 1

atom

Question 2

developed the theory of the atom

Answer 2

john dalton

Question 3

a substance particles that has a negative charge

Answer 3

electrons

Question 4

made the plum pudding modal

Answer 4

J.J. Thomson

Question 5

made Rutherford’s Atomic “Shooting Gallery”

Answer 5

Ernest Rutherford

Question 6

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

Answer 6

nucleus

Question 7

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

Answer 7

electron cloud

Question 8

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

Answer 8

proton

Question 9

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

Answer 9

atomic mass unit

Question 10

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

Answer 10

neutron

Question 11

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

Answer 11

atomic number

Question 12

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

Answer 12

isotope

Question 13

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

Answer 13

mass number

Question 14

the mass of an atom expressed in atomic mass units

Answer 14

atomic mass