florenciaaxell4689 florenciaaxell4689
  • 03-11-2017
  • Chemistry
contestada

How many valence electrons are in an atom of magnesium? (atomic number 12)?

Respuesta :

barnuts
barnuts barnuts
  • 14-11-2017

From the periodic table, Magnesium is actually the element 12 and this belongs to Group 2. We know that an element in Group 2 has 2 valence electrons.

We can also determine this from the electron configuration of Mg which is 1s² 2s²2p⁶ 3s² or [Ne]3s². Since the outermost electron is 3s² therefore magnesium has 2 valence electrons.

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andrewsokolowski
andrewsokolowski andrewsokolowski
  • 05-08-2020

Answer:

10 core 8 valence

Explanation:

Answer Link

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