alkali metal

alkali-earth metal

anion

atomic mass and mass number

atomic mass unit (amu)

atomic number

atomic radii or radius

atomic weight and relative atomic mass

cation

compound

covalent bond

electron

electron cloud

electron configuration

electron shell

element

groups or families

halogens

ion

ionic bond

isotope

mass number and atomic mass

Mendeleev

metal

metallic bond

metalloids

Hund's Rule

neutron

noble gas

nonmetal

nucleus

octet rule

orbitals

Pauli exclusion principle

period

periodic table

polar covalent bond

proton

quanta

quantum numbers

rare earth elements

relative atomic mass and atomic weight

transition metals

valence shell


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