Colloid
Allotropes
Electrons
Nucleus
Groups
Average Atomic Mass
Mass number
Substance
are different forms of the same element.
is a type of suspension.
is the center of an atom.
Is the weighted average mass of its isotopes.
is the sum of the number of protons and neutrons.
are the vertical columns in the periodic table.
are the particles in a atom with a negative charge.
is a type of matter with a fixed composition.
