I need help with this please.

1.      4.83*10^2

2.       2.3*10^-7

3.           -0.00076

4.              8*10^7

5.          0.429

6.         -1*10^6

7.       -900 000

8.                3.08*10^-7

9.                  0.00000953

Explanation:

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.