Question

One atom of $K_{19}^{39}$ contains:

(P-proton, n-neutron and $\overline{e}$​-electron)

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

$K_{19}^{39}$ contains P = 19; $\overline{e}=19;n=20$

Representation of a Element $E$

$E_{AtomicNo.}^{MassNo.}$

Number of neutrons = Mass number-Atomic number

=39-19=20