Question

1) how many valence electron are in the electron-dot structure of H2O
2) in a molecule with covalent bonding
3) which of the following polyatomic ions has a 3-ionic charge
4) Fe2(SO4)3 is called
5) the name of the HSO4-ion is
6) a group of covalently bonded atoms that has an overall electrical charge is called an
7) what is the correct formula for iron (iii) sulfide

Answer 1

(1) In electron-dot structure of H2O there will be 8 valence electrons because O has 6 valence electrons and 2 H atom will share 1 valence electron each so It will be 6 + 2= 8 valence electrons.

(2) In a molecule with covalent bonding sharing of valence electrons take place in order to form a stable octet of electrons hence leading to stability because of filled outer shell.

(3) You didn't give options but still I am providing an answer for it. Polyatomic ions having 3- ionic charge is Phosphate ion (PO4)^-3 [ you shouldn't provide parenthesis () I am writing it so that you don't get confused]

(4) Fe2(SO4)3 is called Iron(iii) Sulphate because Oxidation number of sulphate is -2 and oxidation number of iron in this case is +3

(5) HSO4- ion common name is Bisulfate ion and IUPAC name is Hydrogen Sulphate ion

(6) a group of covalently bonded atoms that has an overall electrical charge is called Polyatomic ion

(7) Iron(iii) Sulfide formula is Fe2S3 because oxidation number of S is -2 and oxidation number of Fe is +3