(i) Element 'Y' with atomic number 3 combines with element 'A' with atomic number 17. What would be the formula of the compound ? (ii) What is the electronic configuration of an element with atomic number 10 ? What will be its valency?

(i) Element 'Y' with atomic number 3 combines with element 'A' with at

1.	(i) Element 'Y' with atomic number 3 combines with element 'A' with atomic number 17. What would be the formula of the compound ? (ii) What is the electronic configuration of an element with atomic number 10 ? What will be its valency?
Answer» Solution :(i) Electronic CONFIGURATION of ELEMENT .Y. with ATOMIC number 3 = 2, 1 Element .A. with atomic number 17 = 2, 8, 7 Formula of the compound : YA. (ii) Electronic configuration of element configuration of the element with atomic number 10 = 2, 8 Valency : Zero.