Atoms like magnesium in Group 2A usually form an ion with a minus 2 charge. Al 3 Cl click for answer. Cations are formed when a particle gains electrons. click for answer. Calcium atoms are part of strong bones and teeth. An acid is a substance like methane CH 4 . click for answer.
Metals usually react to form positive ions.
The octet rule helps predict the number of electrons an atom will gain or lose. The metals typically form ions with a positive charge. Chlorine has seven valence electrons and forms a Cl 1- ion click for answer. Federal law requires food to be chemical free. HCO 3 1- , is found in the extracellular fluids in the body .