Question

2) Complete the following table. Element Atomic number Electronic configuration Period Group N 2,5 2 K 19 IA 14 3 IVA ​

Answer 1

Answer:

Solution

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1.  

19

​

K i.e. potassium has 1 electron in the outermost shell. Its electronic configuration is 2,8,8,1.

2. Berylium (

4

​

Be) and Calcium (

20

​

Ca) belong to group 2. They both are alkaline earth metals and contain valency as 2 and hence, placed in group 2.

3.  

26

​

Fe,  

19

​

K and  

20

​

Ca all belong to the 4th period. Moving left to right across a period, atomic radius usually decreases. Hence, K has the biggest atomic size as compared to  

20

​

Ca and  

26

​

Fe.

Explanation:

Answer 2

Explanation:

Nitrogen ( N ) =

( 2 5 ) E.C

ATOMIC NUMBER 7

NUMBER OF ELECTRONS 7

NUMBER OF PROTONS 7

NUMBER OF NEUTRONS 7

ATOMIC MASS IS 14

VALENCY IS 3-

.

.

.

potassium(K) =

( 2 8 8 1) E.C

ATOMIC NUMBER 19

NUMBER OF ELECTRONS. 19

NUMBER OF PROTONS. 19

NUMBER OF NEUTRONS. 20

ATOMIC MASS IS 39

VALENCY IS 1+