It would be 1s2
Helium has only one energy level with two electrons
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.
One energy level
Atomic StructureNumber of Energy Levels: 1First Energy Level: 2
Helium has completely filled orbitals / energy levels and is chemically inert. So it has no chemically property.
fluorine
The helium energy level diagram helps us understand how electrons are arranged in the helium atom. It shows the different energy levels that electrons can occupy, and how they are filled according to the rules of quantum mechanics. This diagram is important because it helps us predict the behavior of helium and other elements based on their electronic structure.
Helium is the noble gas that has only two energy levels in its electron configuration. Its electron configuration is 1s2, which means it has two electrons in the first and only energy level.
Helium and neon will have their outer energy level filled with two electrons. Helium has 2 electrons in its only energy level, while neon has 8 electrons in its second energy level.
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.
Oh, dude, helium only has two electrons total, so there can't be any in the third energy level. It's like trying to fit a square peg in a round hole - just not gonna happen. So, zero electrons in the third energy level of helium.
I assume you mean energy levels/shells. It has 1.