Question

Elements X,Y,Z are placed in the same Period of the Periodic Table. Z is a smaller atom than Y, which is a smaller atom than X. Which element has the LOWEST atomic number?

Answer 1

X . because as we go from left to right across a period the atomic size decreases and atomic weight increase s

Answer 2

Answer:

(i) X and Z:

(i) X and Z:X and Z have zero valency hence they belong to same group of noble gases.

(i) X and Z:X and Z have zero valency hence they belong to same group of noble gases. (ii) Y and Z:

(i) X and Z:X and Z have zero valency hence they belong to same group of noble gases. (ii) Y and Z:Y = 2,4 and Z = 2,8 so both of them belong to second period with two shells filled.