Three elements X, Y and Z have atomic numbers 7, 10 and.14 respectivel

1.	Three elements X, Y and Z have atomic numbers 7, 10 and.14 respectively.(i) Identify the group number of these elements in the periodic table.(ii) Mention one unique feature each of elements Y and,Z.(iii) Which of the above two elements belong to the same period ?
Answer» (i) X-2,5: Group 15 Y-2,8: Group 18 Z-2, 8,4: Group 14 (ii) Y is a noble gas which is unreactive and has a complete outermost shell. Z is metalloid and possesses semi-metal, properties of both metals and non-metals. (iii) X and V belong to the same period i.e., 2^nd period.

Three elements X, Y and Z have atomic numbers 7, 10 and.14 respectively.(i) Identify the group number of these elements in the periodic table.(ii) Mention one unique feature each of elements Y and,Z.(iii) Which of the above two elements belong to the same period ?

Answer»

(i) X-2,5: Group 15

Y-2,8: Group 18

Z-2, 8,4: Group 14

(ii) Y is a noble gas which is unreactive and has a complete outermost shell.

Z is metalloid and possesses semi-metal, properties of both metals and non-metals.

(iii) X and V belong to the same period i.e., 2^nd period.