Answers to Periodic Table and Simple Ionic Compounds

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Complete the following Table:

Symbol	Atomic Number	Mass Number	Number of Protons	Number of Neutrons	Number of Electrons	Net Charge
\(\mathrm{^{34}_{16}Se^{2-}}\)	16	34	16	18	18	-2
\(\mathrm{^{51}_{23}V^{3+}}\)	23	51	23	28	20	+3
\(\mathrm{^{40}_{20}Ca^{2+}}\)	20	40	20	20	18	+2

Would you expect each of the following atoms to gain or lose electrons when forming ions? What ion is the most likely in each case?

K should lose one electron to form K⁺
F should gain one electron to form F⁻
Ca should lose two electrons to form Ca²⁺

Fill in the following table:

Name	Symbol	Group	Period	Metal, nonmetal or metalloid?	transition metal or main group?
sodium	Na	1	3	metal	main group
iron	Fe	8	4	metal	transition metal
oxygen	O	16	2	nonmetal	main group

Give the formulas for the ionic compounds made of the following ions:

ScBr₃
K₂O
CaI₂
Cr₂S₃
RbF
MgO
K₃N
SrF₂
Al₂S₃