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