What is the electron configuration of an element with atomic number 12?

2 Answers
Feb 12, 2017

Answer:

#"1s"^2"2"^2"2p"^6"3s"^2"#

Explanation:

The element with the atomic number 12 is magnesium. The atomic number indicates the number of positively charged protons in each magnesium nucleus. A neutral atom has equal numbers of protons as negatively charged electrons. The electron configuration of a neutral magnesium atom is:

#"1s"^2"2"^2"2p"^6"3s"^2"#

The Aufbau diagram can help you determine the correct order in which the electrons will fill the orbitals in an atom.

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Feb 12, 2017

Answer:

#1s^2 2s^2 2p^6 3s^2#

Explanation:

The element with atomic number 12 is Magnesium. It has 12 electrons:
2 electrons in the 1st orbital in an s-shell
8 electrons in the 2nd orbital: 2 in an s-shell and 6 in the p-shell
and 2 in the 3rd orbital, an s-shell.

You can use the Aufbau principle to help with the order.