19) a) 6 electrons
b) 13 protons
c) 82 electrons
d) 17 protons
20) a) not electrically neutral
b) not electrically neutral
c) electrically neutral
d) not electrically neutral
21) a) anion
b) neutral atom
c) neutral atom
d) cation
e) cation
22) a) gaining electrons
b) neither, electrically neutral
c) neither, electrically neutral
d) lost one electron
e) lost two electrons
23) a) H
b) Na+
c) Cl-
d) Al3+
24) a) potassium iodide KI
b) calcium sulfide CaS
c) iron (III) bromide FeBr3
d) barium hydroxide Ba(OH)2
e) amonium phosphate (NH4)3 PO4
f) aluminum oxide Al2O3
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