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.
The answer is: d. comparable in size to the heterosexual females
Simon LeVay is a neuroscientist that studies the relation of brain structure and sexual orientation. He examines the interstitial nucleus of anterior hypothalamic cells. The size of the nucleus in homosexual is found to be similar to women while the heterosexual male is much larger. The result doesn't enough to say that sexual orientation is genetic. This proves that there is the dimorphic nucleus in different sexual orientation.
Humus is the passive fraction of soil organic matter. :)
The organic matter in humus is made of soil.
