Question

(ii) What is the valency of Na (11) atom 1
7. (i) How is valency electron related to valency? 2
(ii) What is valency electrons?
8.You are given an element 16
8Z find out 2
(i) Protons, Electrons and neutron in Z
(ii) Write its electronic configuration
9. Describe the essential difference between cathode rays and can rays

Answer 1

Answer:

• state whether s is postie
• negative or zero for the following reaction

Explanation:

2H

2+02 (9) =2H2O (1)