The number of neutrons in any element depends on the isotope of the element you are referring to. Potassium has 24 isotopes, ranging from 32K to 55K. The most stable natural isotope is 39K, which would have 20 neutrons.
Every element (when neutrally charged) has the same number of electrons as it's atomic number. In the case of potassium, it has 19 electrons. If you look at a Periodic Table, the symbol for potassium is K.
The most abundant potassium isotope, potassium-39, has 20 neutrons. Potassium-41, with a natural abundance of 6.73%, has 22 neutrons.
There are 20 neutrons in a potassium-40 atom
Number of Neutrons = Mass Number - Atomic Number
For the most abundant isotope of potasium, 39K: 39-19=20 neutrons
The number of neutrons is different for each isotope of an element.
For potassium isotopes: Atomic Mass of the isotope - 19 = number of neutrons
The most stable atom of potassium has 19 electrons and 20 neutrons.
A neutral atom must contain an equal number of electrons because it is a neutral atom.
Neutral atom of magnesium has 12 electrons.
4 electrons
12
3
A neutral atom must contain an equal number of electrons because it is a neutral atom.
The barium atom (neutral) contain 56 electrons.
Neutral atom of magnesium has 12 electrons.
The neutral atom of promethium contain 61 electrons.
The neutral atom of ununseptium contain 117 electrons.
10
4 electrons
12
The neutral iodine atom contain the same number of electrons as protons - 53.
3
18
an atom is electrically neutral if the protons and electrons are the same number. ex: if you have 16 protons and 16 electrons its is neutral