Group number indicates ………..
a) electrons in outermost shell
b) electron shells
c) sub-shells
d) all of these
Period number indicates …………….
a) electrons in outermost shell
b) sub shells
c) electron shells
d) all of these
Periodicity of Properties:
After a certain intervals the properties of elements………..regularly.
a) repeated
b) never repeated
c) changes
d) none of these
A pattern of repeating properties at regular interval is called …….
a) average
b) arithmetic mean
c) reverse change
d) periodicity of properties
The size of an atom is ……….
a) fixed
b) remains same
c) not fixed
d) none of these
Explanation:Atomic size is rigidly not fixed as when it combines with the other atoms its size varies
