How many electron/s is/are present in the valence shell of potassium? Its atomic No. is 19.
a) 19
b) 1
c) 3
d) 11
What is the atomic No. of Beryllium?
a) 2
b) 4
c) 12
d) 20
What is the atomic No. of Magnesium?
a) 2
b) 4
c) 12
d) 20
What is the atomic No. of Calcium?
a) 2
b) 4
c) 12
d) 20
What is the symbol of Beryllium?
a) Ba
b) Be
c) B
d) Br
What is the symbol of Magnesium?
a) M
b) Ma
c) Mg
d) Mn
