Elements and Periodic Table Review

small, positively-charged center of the atom

• isotope

• nucleus

• electron

• quark

particle in the nucleus with an electric charge of +1

• electron

• neutron

• proton

• element

electrically neutral particle inside the nucleus of an atom

• neutron

• electron

• proton

• molecule

particles with an electric charge of 1-

• protons

• neutrons

• electrons

• elements

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

• compound

• molecule

• key

• atom

an atom with the same number of protons and a different number of neutrons from other atoms of the same element

• isotope

• compound

• molecule

• period

the number of protons in the nucleus of an atom

• electron cloud

• mass number

• atomic number

• atomic mass

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

• element number

• mass number

• atomic number

• electron number

the average total mass of protons and neutrons of an atom

• scale number

• atomic number

• atomic mass

• mass number

horizontal row of elements in the periodic table

• halogen

• family

• group

• period