Please help if u can ty..

a)

b)

c)

d)

e)

Explanation:

The charges of the ions have to be 0, so they balance.

a) has the charge of +2 and has the charge of -1. So its . That means you need one and two to balance the equation. ->

b) has the charge of +4 and has the charge of -1. So its . That means you need one and four to balance the equation. ->

c) has the charge of +3 and has the charge of -2. So its . That means you need two and three to balance the equation. ->

d) has the charge of +2 and has the charge of -2. So its . That means you need one and one to balance the equation. ->

e) has the charge of +1 and has the charge of -3. So its . That means you need three and one to balance the equation. ->

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms