# Atomic Number Of Potassium

### What is the electron configuration, orbital diagram, and noble gas notation of potassium?

The chemistry of potassium is almost etirely that of the potassium ion, K+. A neutral atom of calcium, atomic number 20, contains 20 protons and 20 electrons. It has zero net charge. We calculate the number of neutrons in an atom from its mass number and atomic number: Potassium has a mass number of 39 and an atomic number of 19. Click to see full answer. Potassium (19 K) has 26 known isotopes from 31 K to 57 K, with the exception of still-unknown 32 K, as well as an unconfirmed report of 59 K. Three of those isotopes occur naturally: the two stable forms 39 K (93.3%) and 41 K (6.7%), and a very long-lived radioisotope 40 K (0.012%). Naturally occurring radioactive 40 K decays with a half-life of 1.248×10 9 years. 89% of those decays are to.

Potassium's atomic number is 19. This means that every atom of potassium has 19 protons in its nucleus. In a neutral atom, the number of protons is equal to the number of electrons. So the electron configuration of potassium will involve 19 electrons.

### Atomic Number Of Potassium

The full electron configuration of potassium is $' 1 s {'}^{2} ' 2 s {'}^{2} ' 2 p {'}^{6} ' 3 s {'}^{2} ' 3 p {'}^{6} ' 4 s {'}^{1} '$.

The noble gas notation is $' \left[A r\right] 4 s {'}^{1} '$.

### Atomic Number Of Potassium Ion

The following orbital diagram shows the increase in energy from one energy sublevel to the next, but you can write them on the same level horizontally,