Question

0.
Which of the following is a stable element ?
20 Ca, 6C, 165, 10Ne, 13A1, 2He​

Answer 1

2 He is a stable element.

Answer 2

Answer:

(i)

(i) 18

(i) 18

(i) 18 Ar and

(i) 18 Ar and 2

(i) 18 Ar and 2

(i) 18 Ar and 2 He are very stable are they are noble gases.

(i) 18 Ar and 2 He are very stable are they are noble gases. (ii)

(i) 18 Ar and 2 He are very stable are they are noble gases. (ii) 20

(i) 18 Ar and 2 He are very stable are they are noble gases. (ii) 20

(i) 18 Ar and 2 He are very stable are they are noble gases. (ii) 20 Ca and

(i) 18 Ar and 2 He are very stable are they are noble gases. (ii) 20 Ca and 4

(i) 18 Ar and 2 He are very stable are they are noble gases. (ii) 20 Ca and 4

(i) 18 Ar and 2 He are very stable are they are noble gases. (ii) 20 Ca and 4 Be are in group 2 since number of valence electrons in each is 2.

(i) 18 Ar and 2 He are very stable are they are noble gases. (ii) 20 Ca and 4 Be are in group 2 since number of valence electrons in each is 2.(iii)

(i) 18 Ar and 2 He are very stable are they are noble gases. (ii) 20 Ca and 4 Be are in group 2 since number of valence electrons in each is 2.(iii) 8

(i) 18 Ar and 2 He are very stable are they are noble gases. (ii) 20 Ca and 4 Be are in group 2 since number of valence electrons in each is 2.(iii) 8

(i) 18 Ar and 2 He are very stable are they are noble gases. (ii) 20 Ca and 4 Be are in group 2 since number of valence electrons in each is 2.(iii) 8 O and

(i) 18 Ar and 2 He are very stable are they are noble gases. (ii) 20 Ca and 4 Be are in group 2 since number of valence electrons in each is 2.(iii) 8 O and 16

(i) 18 Ar and 2 He are very stable are they are noble gases. (ii) 20 Ca and 4 Be are in group 2 since number of valence electrons in each is 2.(iii) 8 O and 16

(i) 18 Ar and 2 He are very stable are they are noble gases. (ii) 20 Ca and 4 Be are in group 2 since number of valence electrons in each is 2.(iii) 8 O and 16 S belongs to group 16 since number of valence electrons in each is 6.