Question

1. Among the following, the element with the atomic number 21 is
a) Ca
b) Sc
c) K
d) Ti
2. The number of groups and periods in the long form of the periodic table is
a) 7, 18
b) 18,7
c) 8,17
d) 17,8
3. The number of elements present in the shortest period
a) 1
b) 2
d) 4
4.
The longest periods in the periodic table is
a) 4"
c) 3
b) 7h
c) 6h
d) 54​

Answer 1

Answer:

1st answer: sc

3rd answer:2 elements

4th answer:6h is the longest periodic table

pls mark this answer as brainlist