Question

The atomic no of an element is e5 and mass numbee is 81.the number o

Answer 1

16.2 na..............,....

...

Answer 2

Answer:

Explanation:

Let the number of protons in the element be x. ∴ Number of neutrons in the element 

= x + 31.7% of x 

= x + 0.317 x 

= 1.317 x 

According to the question, 

Mass number of the element = 81 

∴ (Number of protons + number of neutrons) = 81 

Hence, the number of protons in the element i.e., x is 35. 

Since the atomic number of an atom is defined as the number of protons present in its nucleus, the atomic number of the given element is 35. 

∴ The atomic symbol of the element is