The statement which best describes Group 2 elements as they are considered in order from top to bottom of the periodic table is: The number of principal energy levels increases, and the number of valence electrons remains the same.
A periodic table can be defined as an organized tabular array of all the chemical elements, which is typically arranged in order of increasing atomic number or number of protons (in rows).
The chemical elements that are found in Group 2 of the periodic table are referred to as Alkaline Earth metals and they all have the same number of valence electrons of two (2). Some examples of the Group 2 elements include:
For the Alkaline Earth metals, there is an increase in the number of principal energy levels from top to bottom of the periodic table while the number of valence electrons remains the same.
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