What are the verticle columns on the periodic table called?

What are the horizontal rows on the periodic table called?

What are the elements in column 7A (17) called?

Why are the chemical symbols for elements Hg and Br colored purple?

How many vaence electrons do the alkaline earth metals have?

What happens o the number of valence electrons as you move across the periodic table?

Which element is the most reactive nonmetal?

What group is called the Noble Gases?

Why are some elements written in white letters?

Co, Y, Ag and Tc are all

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