Question

In the following table the mass numbers and the atomic numbers of certain

elements are given- (1×4)

Element A B C D E

Mass no. 1 7 14 40 40

Atomic no. 1 3 7 18 20

(a) Select a pair of isobars from the above table.

(b) What would be the valancy of element C listed in the above table?

(c) Which two sub-atomic particles are equal in number in a neutral atom?

(d) Find the number of neutrons in atom D listed in the table.​

Answer 1

Answer:

a] D and E  as isobar have same mass no

b] zero as all shells are filled

c] electron and neutron

d] no of neutron = mass no - atomic no = 40-20= 20

 20 neutrons

hope it helps

plz mark brainliest

Answer 2

Explanation:

a) D[Argon] and E[Calcium] are isobars

b) 3

c) Electron and Neutron

d) Number of neutrons=Mass number-Atomic number

=40-20

=20

Therefore 20 neutrons