Answer: The bold staircase in the periodic table allows us to classify which elements are metalloids.
Explanation: Additionally, it acts like a "divider" that allows us to properly distinguish the metals from the non-metals in the periodic table.
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Answer: Arsenic has five valence electrons.
Explanation: Good luck!
Not sure about the first two but I think number three is B. sorry if I'm wrong
Both are already balanced. Hope it helps
