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 ?

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» Solution :(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 COMPLETE outermost SHELL. Z is metalloid and possesses semi-metal, properties of both metals and non-metals. (iii) X and Y belong to the same PERIOD i.e., `2^(nd)` period.