Question

Among the following element group number is not equal to valence electron?

Answer 1

Among the following element group number is not equal to valence electron:

Na

N

Ne

None

Explanation:

Periodic table

A tabulated form that has different elements arranged in a systematic manner .

It consists of groups and periods

Groups : they are vertical rows .

Periods : they are horizontal rows .

In modern periodic table there are 18 groups and 7 periods .

In a  group : elements have same valence electron.

In a period : elements have same shell to which valence electron enters  

Let us see , to which group these above elements are placed :

1.Na (sodium )

Atomic number = 11

electronic configuration = 2,8,1

Valence electron =1

It belongs to group 1 (rightly placed in periodic table ).

2. N (nitrogen )

Atomic number = 7

electronic configuration = 2,5

Valence electron =5

It belongs to group 15 (rightly placed in periodic table )

3. Ne (Neon )

Atomic number = 10

electronic configuration = 2,8

Valence electron =8

It belongs to group 1 8 (rightly placed in periodic table )

so, the correct answer is : None

Answer 2

Answer:

the correct answer is none