How to Calculate Neutron Number

X is the relative abundance. The atomic number of an element is equal to the number of protons in its nucleus.

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M2 is the mass of the second isotope.

. The average isotopic mass. Suppose you have a chlorine 35 and 37. Formula to calculate relative abundance.

ME is the atomic mass of the element from the periodic table. Isotopes are variants of a particular chemical element which differ in neutron number and consequently in nucleon number. In a neutral atom the number of protons equals the number of electrons in shells which is the energy level around the nucleus.

Isotopes are atoms with the same atomic number but distinct neutron numbers and hence distinct mass numbers. M1 is the mass of one isotope.

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