The element sodium has 12 neutrons. The element also has an atomic number of 11, meaning that it has 11 electrons and 11 protons. It has an atomic mass of 22.9, which is often rounded up to 23 to accurately determine the number of neutrons in the element.
An element's atomic mass and atomic number determine the number of neutrons. An element's mass number is equal to the number of protons plus the number of neutrons in the element. For sodium, there are 11 protons, since the atomic number of the element is 11. Sodium also has a rounded atomic mass of 23. Therefore, the number of neutrons is 12, since 11 plus 12 equals 23.Learn More
There are 48 neutrons in the chemical element krypton. This is calculated by subtracting the number of protons from the mass number of krypton. The mass number of krypton is 84, and the number of protons is 36.Full Answer >
The element argon contains 22 neutrons. The number of neutrons an element has is determined by subtracting the number of protons from the element's atomic weight.Full Answer >
Magnesium has 12 neutrons. An alkaline earth metal, magnesium also has 12 electrons and 12 protons. Its chemical symbol is Mg, and it has an atomic number of 12.Full Answer >
Potassium has 20 neutrons, 19 protons and 19 electrons. It has the chemical symbol K and is an alkali metal. It has a low density of 0.89 grams per cubic centimeter and an atomic weight of 39.09 grams per mole.Full Answer >