Two
An atom of helium has 2 electrons.
Sodium has 11 electrons.
13
Copper atom has 29 electrons.Uranium atom has 92 electrons.
Tantalum
Tantalum has 73 protons and electrons and its isotopes have 108 or 107 neutrons.
Tantalum has 73 protons, 73 electrons, and isotopes of Tantalum include a varying number of neutrons. The most common isotope, Tantalum-181, has 108 neutrons.
Two
Tantalum needs to lose 2 electrons to become stable. Tantalum has 73 protons, so losing 2 electrons will give it a full outer shell of 71 electrons, which is the most stable configuration for the element.
Tantalum has 73 protons and 73 electrons. The number of neutrons can vary, but the most common isotope of tantalum, Ta-181, has 108 neutrons.
An atom of nitrogen has 7 electrons.
An atom of helium has 2 electrons.
The number of electrons depends on what type of atom it is.
A Mercury atom has 80 electrons.
A germanium atom has 32 electrons.
The neutral atom of potassium has 19 electrons.