Question

without looking at the periodic table, select from each of the following lists, the elements belonging to same group
(a)Z= 12, 38,4,88
(b)Z=9,16,3,35
(c)Z=5,11,27,19
(d)Z=24,47,42,55​

Answer 1

Answer:

option a is correct .because every period is having certain intervals such as 2,8,8,18,18,32,31 to 1 to 7 periods respectively. so that if we add these numbers to element atomic number we can get next element of the same group.a) 4, 4+8,12+8,20+18,38+18,56+32