Question

What are the two main categories of elements on a periodic table?

Answer 1

Hydrogen: 1 proton, 1 elecrton.  

Helium: 2 protons, 2 neutrons, and 2 electrons.  

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Answer 2

Heya buddy here is ur answer ‼️‼️‼️ Metalloids and non metals are categories of elements of periodic table.