Question

Two elements are denoted as follow (i) 40A (ii) 40B
20. 20

(a) find the no. Of electrons present in A and B.
(b) find the no. Of nucleons present in A and B.
(c) explain the special 'term' used to represent A and B

Answer 1

(a) no of electrons in A=20
no of electrons in B=20

(b)no of nucleons in A=20
no of nucleons in B=20

(c) isotopes

Answer 2

(A) No. of electron A = 20B
No. of electron B = 20B

B; No of nucleus A =20B
No of nucleus B =20B

C: isotopes