What is the electron configuration for helium?

Answer 1

#"He: " 1s^2#

Helium, #"He"#, has an atomic number equal to #2#, which means that it has #2# protons in its nucleus.

A neutral helium atom will thus have #2# electrons surrounding its nucleus. This means that the electron configuration for helium has to account for only #2# electrons.

Both of these electrons are located on the first energy level, in the only subshell, and consequently only orbital available to them.

More specifically, both electrons will occupy the #1s# orbital, the only orbital located in the #s# subshell.

The electron configuration will thus be

#color(green)(|bar(ul(color(white)(a/a)color(black)("He: " 1s^2)color(white)(a/a)|)))#

Here's how the electron configuration of helium looks compared with that of hydrogen, #"H"#, which only has #1# electron surrounding its nucleus.

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Answer 2

The electron configuration for helium is 1s^2.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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