Chemistry Unit 4

Front 1

atom

Back 1

the smallest piece of an element that has all the properties of that element

Front 2

atomic number

Back 2

the number of protons an atom has in its nucleus

Front 3

Bohr diagram

Back 3

diagram that shows the number of protons and neutrons in a nucleus that orbit energy levels and electrons

Front 4

chemical symbol

Back 4

one or two letter initial that represents the name of an element

Front 5

electron

Back 5

a negatively charged particle that moves in an orbit shell outside an atoms nucleus

Front 6

energy level

Back 6

electrons are found in the paths around an atoms nucleus energy level

Front 7

family

Back 7

a vertical column in the periodic table that contains similar element qualities

Front 8

isotope

Back 8

atoms of the same element that have different numbers of neutrons in their nuclei

Front 9

mass number

Back 9

the total number of protons and neutrons in a nucleus

Front 10

metalloid

Back 10

an element with properties of both metals and nonmetals

Front 11

metal

Back 11

any element on the left side of the Periodic Table except hydrogen; good conductors of electricity

Front 12

neutron

Back 12

a particle within an atoms nucleus that had no electrical charge

Front 13

non-metal

Back 13

an element that lacks the characteristics of a metal;elements on the right side of the Periodic Table

Front 14

period

Back 14

horizontal column in the Periodic Table that represents the energy level of an element

Front 15

Periodic Table

Back 15

a table of all of the elements arranged by number and grouped according to similar properties

Front 16

proton

Back 16

a positively charged particle in an atom’s nucleus

Front 17

nucleus

Back 17

the positively charged central core of an atom, containing most of the mass