The mass number, also known as the atomic mass number or nucleon number, represents the total number of protons and neutrons present in the nucleus of an atom. It is a whole number and is different from the <a href="https://www.wikiwhat.page/kavramlar/atomic%20weight" target="_blank">atomic weight</a>, which is a weighted average of the atomic masses of all isotopes of an element.
Here's how to find the mass number:
Identify the number of protons: The number of protons in an atom defines which element it is. This is also the <a href="https://www.wikiwhat.page/kavramlar/atomic%20number" target="_blank">atomic number</a> of the element, usually found on the periodic table.
Identify the number of neutrons: The number of neutrons can vary even for the same element. Atoms of the same element with different numbers of neutrons are called <a href="https://www.wikiwhat.page/kavramlar/isotopes" target="_blank">isotopes</a>. The number of neutrons is often given in the problem or can be deduced if you know the element and the mass number.
Calculate the mass number: Mass Number = Number of Protons + Number of Neutrons
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