I assume you mean energy levels/shells.
It has 1.
Helium atom has 2 electrons.
Helium has two neutrons and two protons in its nucleus.
A helium atom consists of 2 protons, 2 electrons and 2 neutrons.
Helium will have only 2 electrons
Helium is an element- the second one in the periodic table.
Helium atom has 2 electrons.
A neutral atom of helium has 2 electrons.
Helium has one kind of atom: helium.
2
Elements are not species. Helium is an element. Helium can be a single atom.
Helium has two neutrons and two protons in its nucleus.
A sulfur atom is about 32 times heavier than a helium atom. This is based on the atomic masses of sulfur (32 amu) and helium (4 amu).
A helium atom consists of 2 protons, 2 electrons and 2 neutrons.
helium has 2 electrons as its atomic number is 2
Helium will have only 2 electrons
Helium is an element- the second one in the periodic table.
Water has no helium (He) atom. Chemically water is H2O and there is no He atom present in water.