Chemistry Examples

Find the Number of Neutrons
He
Find the element on the periodic table.
0Atomic Number
Element Symbol
Element Name
0Average Atomic Mass
The atomic weight is basically a measurement of the total number of particles in an atom's nucleus including both protons and neutrons. So the first step is to locate the atomic mass on the periodic table, and round the value to the nearest whole number.
round to
The mass number is the number of particles in an atom's nucleus. The nucleus is made up of protons and neutrons.
Find the element on the periodic table.
0Atomic Number
Element Symbol
Element Name
0Average Atomic Mass
To find the number of protons in , first locate the element on the periodic table. Next, find the atomic number which is located above the element's symbol. Since 's atomic number is , has protons.
protons
Fill in the known values where represents the number of neutrons.
Rewrite the equation as .
Add and .
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