How does the nucleus change in beta-plus decay?1point)The mass number remains the same, and the atomic number decreases by one. The mass number decreases by one and the atomic number remains the same. The mass number increases by one,and the atomic number remains the same.. The mass number remains the same,and the atomic number increases by one.

Answer 1

In beta-plus decay (β+ decay), a proton in the nucleus is converted into a neutron, and a positron (the antimatter counterpart of an electron) is emitted.

As a result:

• The mass number remains the same because the total number of nucleons (protons + neutrons) does not change.
• The atomic number decreases by one because there is one less proton.

Therefore, the correct statement is: The mass number remains the same, and the atomic number decreases by one.