Question

How many protons are in the radioactive isotope 40/19K?

Answer 1

19 protons



hope this helps

Answer 2

Answer: 19 protons are present in the given isotope.

Explanation: We are given a radioactive isotope
`^(40)_(19)K` and we need to find the number of protons in this isotope.

General representation of isotopes are given as:

`^A_Z\textrm{X}`

Where, Z = Atomic number = Number of protons = Number of electrons

A = Atomic Mass = Number of protons + Number of neutrons

X = Element

In the given element K, Atomic number is 19 and mass number is 40.

As Z = 19,

Number of protons in given isotope = 19.