1)A)The nucleus is a dense region of positive charge that always contains protons and neutrons.B)All atoms of a given element have a constant composition and are different than atoms of anyother element.C)Matter cannot be either created or destroyed in a chemical reaction.D)All samples of a given compound have the same proportions of their constituent elements.E)none of the above2)Covalent bonding is a2)A)gain of electrons.B)loss of electrons.C)transfer of electrons.D)sharing of electrons.3)Which of the following species is a molecular element?3)A)neonB)sodiumC)carbon dioxideD)chlorineE)none of the above4)How many electrons will aluminum gain or lose when it forms an ion?4)A)lose 2B)gain 5C)lose 1D)gain 1E)lose 35)To form an ion, a sodium atom ________.5)A)loses two electronsB)gains two electronsC)loses one electronD)loses seven electronsE)gains one electron6)Which metal atom below cannot form a cation of several different charges?6)A)BaB)CrC)FeD)MnE)none of the above7)What is the name of the compound made from lithium and oxygen?7)A)lithium dioxideB)oxygen lithideC)lithium(I) oxideD)lithium oxideE)none of the above1 8)What is the formula for an ionic compound made of barium and nitrogen?8)A)BaNB)Ba3N2C)Ba2N4D)Ba2N3E)none of the above9)What is the name of CoS?9)A)cobalt(II) sulfideB)cobaltous sulfurC)cobalt sulfideD)cobalt monosulfideE)none of the above10)The charge of a vanadium ion in the compound V2O5is:10)A)5+B)10+C)2+D)10-E)none of the above11)Which formula shows the proper use of parentheses?11)A)Ca(NO3)2B)(NH4)3(PO4)C)Ca(F)2D)Ca(SO4)E)none of the above12)How many carbon atoms are in the formula Al2(CO3)3?12)A)3B)6C)9D)1E)none of the above13)What is the correct formula for a compound that has three oxygen atoms and one sulfur atom?13)A
