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.

Answer 1

To analyze the statements regarding magnesium (Mg) and calcium (Ca):

1. Noble Gases: Neither magnesium nor calcium is classified as a noble gas. Noble gases are found in Group 18 of the periodic table (e.g., helium, neon, argon).

2. Valence Electrons: Magnesium (Mg) is in Group 2 and has 2 valence electrons, while calcium (Ca) is also in Group 2 and similarly has 2 valence electrons. So they both have the same number of valence electrons.

3. Electron Shells: Magnesium has 3 electron shells (2, 8, 2) and calcium has 4 electron shells (2, 8, 8, 2). So they do not have the same number of electron shells.

The correct statement is: They both have the same number of valence electrons.