When cells divides into two identical cells, it undergoes mitosis permeating. It mostly occurs in sexual reproduction. Mitosis makes everything except the sex cells. It has two diploid.
17 protons 18 neutrons and 18 electrons
it fasten the rate of reaction
It enters and or leaves it through two separate mechanisms. One is the Sodium potassium pump which works as a gatekeeper for sodium and potassium ions that go in and out of the cell. This is active transport. Another way how it enters/leaves cells is with the help of passive ion channels where they can cross without much difficulty.