Atom
Most of the mass of an atom is found here.
What is the nucleus?
Each row in the periodic table ends with this kind of element.
What is a nonmetal?
Dot diagram represent this.
Atoms of the same element with different numbers of neutrons is this.
What are isotopes?
This is what happens to the size of an atom as it goes left to right on the periodic table.
What is decreases?
Represents the number on the top left of a chemical symbol. 12C
What is mass number?
Area that contains elements with two valence electrons.
What is group 2?
Horizontal rows of the periodic table represent this.
What is periods?
Represents the number on the top left of a chemical symbol. 2H+
What is the charge?
The number of electrons in the outer energy level most atoms need to be stable.
What is 8?
The area that is know as the halogens.
What is group 17?
40 represents this in Argon - 40.
What is mass number?
When an atom has lost or gained electrons.
What are ions?
Reason why noble gases are nonreactive.
What is a full set of valence electrons?
The particles that must equal each other in a neutral atom.
What are protons and electrons?