1) Which of the following is a possible formula unit? PbO Li2B Al2Pb3 ClO

2) What is the formula of a compound formed between iodine (I) and calcium (Ca) ?

3) What is the resulting formula unit when strontium (Sr) and phosphorus (P) bond?

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1. PbO is a possible formula units, since O has charge of 2 - and Pb can have a charge of 2 + or 4+, if it uses the 2 + ion, the charges will balance out to form PbO. Li + and B (3-) would have Li3B, Al (3+) and Pb (2+) are both positive charges and would not balance out, Cl - and O (2-) are both negative charges and would not balance out.

2. Iodine is a halogen, so it has a charge of - 1. Calcium is an alkaline earth metal in Group 2, so it has a charge of 2+. Therefore, if they were to form a formula unit, the resultant would be CaI2 (2 iodine atoms of 1 - charge are needed to balance out the 2 + charge on the calcium atom).

3. Strontium is an alkaline earth metal with a charge of 2+, while phosphorus has a charge of 3-. Therefore, to balance the charges out, we would need 3 atoms of strontium and 2 atoms of phosphorus. This would give the formula unit of Sr3P2.