What is the mass number of an isotope which has 26 electrons, a charge of +3, and 32 neutrons?
The mass number of an isotope is the sum of the number of protons and neutrons present in its nucleus.
Given that the isotope has a charge of +3, it means that it has lost 3 electrons, resulting in a total of 26 - 3 = 23 electrons.
Since an atom is electrically neutral, the number of protons in the nucleus is equal to the number of electrons. Therefore, the isotope has 23 protons.
The number of neutrons is given as 32.
Therefore, the mass number of the isotope is calculated as:
Mass number = 23 (protons) + 32 (neutrons) = 55.
So, the mass number of the isotope is 55.