Homework help with chemistry?

Question

Which is an example of an alkali metal that does NOT exist independently in nature or in the laboratory?

NaCl

NaNO3

Na+

NaOH

Alkali metals have a charge of ____, while alkaline earth metals have a charge of _____.

1+, 2+ 1+, 1+

2+, 1+ 2+, 2+

Which of the following compounds is used to treat bipolar disorder?

CaCO3 Li2CO3

NaNO3 NaHCO3

And can someone verify my answers are right for these:?

Select the charge each atom will have when it has a complete set of valence electron

Calcium

Ca2-

Sodium

Na-

Potassium

K-

Magnesium

Mg2-

Lithium

Li-

Thanks a ton!

Answer 1

Cations cannot exist without the presence of an anion.  Thus, Na+ would never exist ON ITS OWN (but wouold exist if it was present with say Cl- ions).

Alkali metals, being in group I of the table of elements, generally have a charge of +1 while alkaline earth metals (group II), have a charge of +2.

I don't really understand what you mean by having a complete set of VEs.

Normally, Ca has 2 valence electrons

Sodium has 1

Potassium has 1

Magnesium has 2

Lithium has 1

[Answer: see above]