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(i) Element 'Y' with atomic number 3 com...

(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?

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(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.
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