six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony, and tellurium. Five elements are less frequently so classified: carbon, aluminium, selenium, polonium, and astatine.
I think this is true because they’re in the same layer, strata which would mean they died around the same time. Hope this helps sorry if it’s wrong!
Answer: option B. The number of the outer most energy level for elements in that period
Explanation:
The answer is degree of ionization. I'm guessing you have already taken the quiz.