Chemistry, 15.12.2020 21:20 kyracrapse121

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A mystery element has 18 protons. Which one of the following statements is true about the element?
The element belongs in row 2 of the periodic table and is classified as a halogen.
The element belongs in row 3 of the periodic table and is classified as a noble gas.
The element belongs in row 4 of the periodic table and is classified as an alkali metal.
The element belongs in row 5 of the periodic table and is classified as an alkaline earth metal.

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A mystery element has 18 protons. Which one of the following...