|
|
|
3
|
elements of group 18 are known as
|
|
5
|
the ---------- is equal to number of shells in an atom
|
|
6
|
electronegativity is maximum for group-------------
|
|
7
|
total number of elements present in fourth period are
|
|
8
|
the first period contains----------elements
|
|
9
|
modern periodic law is based on atomic----------
|
|
10
|
atomic size------------from top to bottom
|
|
|
|
|
|
|
1
|
the number of valence electrons in F is
|
|
2
|
elements of same group have same number of---------
|
|
4
|
if two elements have same number of shells then they belong to same------
|
|
|
|
