all of the following are monovalent atomic groups except …….. group           a)nitrate.          b)hydroxide.                     c)phosphate.

…….. are the most stable elements. a)metals b)nonmetals c)noble gases

Ammonium chloride salt is formed on the combination of ….. a)a negative nonmetal ion with a positive atomic group.     b)a negative nonmetal ion with a negative nonmetal ion.      c)a positive metal ion with a negative atomic group

14. What is the chemical formula of the ionic compound magnesium chloride?         a)MgCl2          b) Mg2Cl      c)MgCl

13. Atoms of iron can have a valency of either 2 or 3.        What is the name given to compounds formed from iron atoms with a valency of 2?                  a) Ferry       b)Ferric     c) Ferrous

all of these substances turn litmus paper into red except….. a)HCl     b)HNO3       c)NaOH

6) Nitrate and nitrite groups are different in the …. .....a)types of atoms.      b)number of atoms.        c)valency.

1) when an acid dissolves in water, it produces …… ions.      a)(OH)+      b)H-        c)H+

all of these substances turn litmus paper into blue except….. ...a)NaOH         b)KOH       c)HBr

on the combination of (Mg)+2 ion with (CO3)-2 group……..is formed.                                           a)an acid         b)a base     c) a salt

2) when a nonmetal gains or shares two electrons, it’s valency will be ….. a)monovalent        b)divalent c)trivalent

1) when an base dissolves in water, it produces …....… ions. a)(OH)+ b)H- c)H+