What is the mass number of an ion with 109 electrons?

The mass number of an ion is the total number of protons and neutrons in the nucleus of the ion. Since the number of electrons is not included in the mass number, the mass number of an ion with 109 electrons will be equal to the total number of protons and neutrons present in the nucleus.

To determine the mass number of the ion with 109 electrons, we need to know the atomic number of the element that the ion belongs to. The atomic number of an element is equal to the number of protons in its nucleus. For example, if the ion belongs to the element with an atomic number of 56, then it will have 56 protons in its nucleus.

Since the number of electrons in an ion is equal to the number of protons, the ion with 109 electrons will also have 109 protons. Therefore, the mass number of this ion will be equal to the sum of protons and neutrons present in its nucleus. The number of neutrons can be calculated by subtracting the atomic number from the mass number.

The mass number of the ion with 109 electrons will depend on the atomic number of the element it belongs to and can be calculated using the formula:

Mass number = Number of protons + Number of neutrons

Therefore, the mass number of the ion with 109 electrons will be different based on the specific element the ion belongs to.