Question

The electron configuration for Helium (He) is shown below. 1s2 Which diagram shows the correct distribution of electrons in the electron shells of a helium atom? mc024-1.jpg mc024-2.jpg mc024-3.jpg mc024-4.jpg Mark this and return

Answer 1

As you can see in the picture presented below, Helium (He) is a noble gas with a stable 1s2 electron configuration.
This means that an atom of Helium has two electrons that are orbiting the atom's core in the first, S orbit. The two electrons are in the same orbit, but they orbit in opposite directions, they have an opposite spin.

Answer 2

Answer is in the picture below.

Helium (symbol: He) is an element with atomic number 2 (two protons and two electrons) and mass number 4 (2 neutrons; n° = 4 - 2 = 2).

Electron configuration of helium atom: ₂He 1s².

Helium is a noble gas.

Noble gases are in group 18: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radon (Rn). They have very low chemical reactivity.