(a) An element X has mass number 40 and contains 21 neutrons in its at

1.	(a) An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the periodic table does it belong ?(b) The element X forms a compound X2Y. Suggest an element that Y might be and give reasons for your choice.
Answer» (a) Group 1 (2, 8, 8, 1). (b) Oxygen (X is monovalent so Y has to be divalent to form the compound X₂Y)

(a) An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the periodic table does it belong ?(b) The element X forms a compound X2Y. Suggest an element that Y might be and give reasons for your choice.

Answer»

(a) Group 1 (2, 8, 8, 1).

(b) Oxygen (X is monovalent so Y has to be divalent to form the compound X₂Y)