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Unfortunately, there’s no universal agreement on this, but many versions of the Periodic Table will offer some guidance.
Certainly, all of the elements in Groups 1-12 except hydrogen are considered metals.
There’s pretty good agreement that all of the elements in columns 17 and 18, plus elements ##”H, C, P, Se”##, and the elements to the right of them are non-metals.
As you go down a Group, the elements become more metallic.
Most chemists would say that ##”Al, Ga, In, Tl, Nh, Sn, Pb, Fl, Bi, Mc,”## and ##”Lv”## are metals.
In between these broad groups are the and semiconductors, and different versions of the Periodic Table differ in how individual elements in this region are classified.
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