16 protons 20 neutrons
The isotope 210Rn has 86 protons and electrons; also 124 neutrons.
The C-12 isotope has 6 protons and 6 neutrons.
The carbon-12 isotope has 6 protons and 6 neutrons. This isotope is the most stable and abundant form of carbon.
Promethium has 61 protons and electrons.For each isotope the number of neutrons is different. Number of neutrons = Mass number of an isotope - 61
6 protons. The number of neutrons varies, but the most common isotope has 6 neutrons.
In the most abundant isotope of iron, there are 26 protons and 26 neutrons.
Actinium has 89 protons and 138 neutrons (the natural isotope 227Ac).
Boron has 5 neutrons and 5 protons for its most common isotope
Californium has 98 protons and neutrons.For each isotope the number of neutrons is different.Number of neutrons = Mass number of an isotope - 98
Promethium has 61 protons and electrons; For each isotope the number of neutrons is different. Number of neutrons = Mass number of an isotope - 61
Boron has 5 neutrons and 5 protons for its most common isotope
This isotope has 20 protons and and electrons and 22 neutrons.