1.	T	Potassium forms an ion with a +1 charge.
2.	T	Ions are particles with an electric charge.
3.	F	All cations have the same positive charge.
4.	T	Table salt, NaCl, is an example of an ionic substance.
5.	F	Atoms like magnesium in Group 2A usually form an ion with a minus 2 charge.
6.	T	Calcium usually forms ions with a +2 charge.
7.	F	Al3+ and Cl1- form a substance with the formula Al3Cl
8.	F	Cations are formed when a particle gains electrons.
9.	F	Calcium atoms are part of strong ones and teeth.
10.	F	An acid is a substance like methane CH4.
11.	T	Metals usually react to form positive ions.
12.	T	The octet rule helps predict the number of electrons an atom will gain or lose.
13.	F	A water solution of NaOH contains the Na+ , O2- and H+ ions.
14.	T	The metals typically form ions with a positive charge.
15.	T	Chlorine has seven valence electrons and forms a Cl1- anion
16.	F	Federal law requires food to be chemical free.
17.	T	Bicarbonate ion, HCO31-, is found in the extracellular fluids in the body.
18.	T	Hydroxide ions are OH1- ions.
19.	T	All atoms in the pure element have an apparent charge or oxidation number of zero.
20.	F	Ionic substances are usually soft and low melting.