A table of chemical elements arranged in order of atomic number and organized in periods (rows) and families (columns).
An atom is the smallest particle of an element that keeps the same chemical identity of the element.
Something that is composed of two or more seperate elements
A particle found in an atom, but outside the nucleus, with an electric charge
Atoms of the same element with different numbers of neutrons in the nucleus
An atom with a balanced electric charge, or zero electric charge
A chunk of frozen rock and ice that hits Earth
A salt of nitrous acid
A particle found in the nucleus of an atom with no electric charge (A neutron actually has both a positive and negative charge so the charges cancel each other out;therefore neutrons are said to have no charge)
The tiny core at the center of an atom which contains most of the atom's mass and all of the atom's protons
A very small portion of matter
A particle found in the nucleus of an atom with a positive charge exactly equal to and opposite an electron's negative charge