Question

Write a relation between atomic number and mass number

Answer 1

Answer:mass number = atomic number + number of neutrons

Explanation: actually mass number is equal to the sum of no of protons/electrons and number of Neutrons. As no. Of protons or electrons is the atomic number the above relation is correct

Answer 2

Answer:

if we don't consider exceptions then

odd atomic number has mass no. = (n×2) +1

example: sodium , atomic number is 11

so mass = (11 ×2) +1

= 23

even atomic no. has mass no. = n×2

example: magnesium, atomic number is 12

so mass = 12×2

= 24

this works best for first 20 elements.

hope it helped.