Helium has only one energy level with two electrons
One energy level
Electrons of hydrogen fill up to two energy levels, while electrons of helium fill up to a total of two energy levels as well. Helium has an additional energy level compared to hydrogen because it has 2 electrons, filling up both the first and second energy level.
It would be 1s2
I assume you mean energy levels/shells. It has 1.
Helium has completely filled orbitals / energy levels and is chemically inert. So it has no chemically property.
Helium has one kind of atom: helium.
Helium has 2 electrons.
Helium has 2 protons.
Helium has only one type of gas (which is helium itself)
Atomic StructureNumber of Energy Levels: 1First Energy Level: 2
Helium has more emission lines than hydrogen because it has more electrons and energy levels, leading to more possible transitions between these levels and the emission of different wavelengths of light.
The number of helium atoms is 6,022 140 857.10e26.