How many elements are present in the first period?
a) 2
b) 8
c) 18
d) 32
How many electrons are present in the outermost shell of elements present in group IIIA?
a) 1
b) 2
c) 3
d) 8
Which of the following group contains noble gases?
a) IA
b) IIA
c) VIIA
d) VIIIA
Period number of neon (atomic no. 10) is……
a) 1
b) 2
c) 3
d) 4
A
by at 2025-04-16 01:02:23