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Which Statement about magnesium [Mg] and calcium [Ca] is correct?

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They are both classified as noble gases.
They both have the same number of valence electrons.
They both have the same number of electron shells.

1 answer

The correct statement among the options provided is:

They both have the same number of valence electrons.

Both magnesium (Mg) and calcium (Ca) are in group 2 of the periodic table, which means they each have 2 valence electrons.

The other statements are incorrect:

  • They are not classified as noble gases; noble gases are found in group 18.
  • Magnesium has 3 electron shells (1s² 2s² 2p⁶ 3s²), while calcium has 4 electron shells (1s² 2s² 2p⁶ 3s² 3p⁶ 4s²).