chemistry questions---helpp!!?

Question

plzzz give me the answers for the following questions,,,i cant answer them!!!!help plzzzz


1)formula for Barium Sulphate

2)chemical name for KCN

3)following is a table---
A B C D E F G H
2 3 3 6 9 11 19 23 MASS NOS.
1 1 2 3 4 5 9 11 ATOMIC NOS.

where A,B,C..... all are elements with there respected mass and atomic numbers
Q)--which of the above will form single positively charged ion?
Q)--which of the above will form single negatively charged ion?

Answer 1

1) Ba(SO4)2 is barium sulphate
2) KCN is potassium cyanide
3) First remark important Only the atomic number governs the chemical properties , so the atomic masshas no influence on ions formation

single positive ions : A and B which are isotopes of hydrogen D which is an isotope of lithium and H which is sodium from single positive ions

single negative ion G which is fluorine ion (Z=9) forms a single negative ion

Answer 2

1) Barium Sulphate is BaSO4.

2) KCN is Potassium Cyanide.

3) D is Lithium and H is Sodium and both can form single +ve charged ions.

G is fluorine and it forms single -ve charged ions.