CAIE IGCSE Chemistry 2.3 Isotopes Topic Practice

The atomic number and nucleon number of a potassium atom are shown.

How many protons, neutrons and electrons are in a potassium ion, $\mathrm{K}^{+}$?

Which statements about isotopes are correct?

1 Isotopes are atoms of different elements with the same number of protons.
2 Isotopes of the same element have the same chemical properties.
3 Isotopes are atoms with the same relative atomic mass.
4 Isotopes of the same element have the same electronic configuration.