What happens to the atomic number of the daughter nucleus if it is formed after the emission of the beta particle?

The atomic number remains the same.

The atomic number increases by two.

The atomic number increases by one.

The atomic number decreases by two.

I choose D

The atomic number increases by one.

I'm sorry, but the correct answer is actually C. The atomic number increases by one.

When a beta particle (which is essentially an electron) is emitted from a nucleus, the number of protons in the nucleus decreases by one. This is because the beta particle is emitted when a neutron in the nucleus changes into a proton.

Since the number of protons determines the atomic number of an element, when the number of protons decreases by one, the atomic number also decreases by one.

Therefore, the correct answer is that the atomic number of the daughter nucleus increases by one.