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Use the periodic table to answer the question. Which Statement about magnesium [Mg] and calcium [Ca] is correct? * 1 point

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 about magnesium [Mg] and calcium [Ca] is:

They both have the same number of valence electrons.

Both magnesium and calcium are in Group 2 of the periodic table, which means they each have 2 valence electrons.

The other statements are incorrect because:

  • Neither magnesium nor calcium is classified as a noble gas; noble gases are found in Group 18.
  • Magnesium (atomic number 12) has 3 electron shells, while calcium (atomic number 20) has 4 electron shells.