The atomic number always equals to the number of protons. which in this case, is 20
This the cation Ca2+.
This is not an atom. This is an ion. This is Na+ ion.
It is the Sr+2 ion. It is formed by a Sr atom.
A neutral atom has an equal number of protons and electrons. Protons are positively charged, and electrons are negatively charged. Therefore if you have an ion with a -1 charge, it has one extra electron. So your ion has 85 protons.
35 protons, 36 electrons
There are two main isotopes of chlorine. Every chlorine atom has 17 electrons where there are 18 and 20 neutrons in chlorine-35 and chlorine-37 respectively.
17O2-
potassium
108Sn+2
Na+ sodium ion has 11 protons, 12 neutrons and 10 electrons
Co 2+
S for sulfur because the number of protons tells you the atomic number with is 16 and 16 is sulfur. The electrons means it is an ion with two more electrons than protons. The neutrons have no charge but add mass to the element.
20 protons indicate that the particle has an atomic number of 20 and is thus, calcium Ca. Since it has two more protons than it has electrons it must have a charge of 2+. So, the symbol will be Ca2+.
P3- has 15 protons, 16 neutrons and 18 electrons.
13 protons and 14 neutrons. The fact that its an ion doesn't change that ... only the number of electrons.
Te2- ion
This is the ion of the isotope Pb-208 (Pb2+).
20 protons and 18 electrons