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3 years ago

The electron configuration for an atom is 1s 2s 2p2. How many electrons does the atom have?

Chemistry

1 answer:

taurus [48]3 years ago

7 0

Answer:

Four

Step-by-step explanation:

The superscripts in an electron configuration tell us how many electrons are in a subshell.

If the electron configuration is 1s¹ 2s¹2p², the total number of electrons is

1 + 1 + 2 = 4

The atom contains four electrons.

Note: this atom is in an excited state, because the 1s and 2s subshells can each hold one more electron.

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