When one beta particle is emitted from the nucleus of an atom the _____?

جب ایک بیٹا ذرہ کسی ایٹم کے نیوکلئس سے _____ سے خارج ہوتا ہے؟

Atomic mass decreases by

Atomic number decreases by 1

Atomic number increases by 1

None of these

In beta decay (β⁻ emission), a neutron in the nucleus converts into a proton and emits a beta particle (electron).

This increases the atomic number by 1, but the atomic mass remains nearly the same.