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Alkali metals include:
- Li, Na, K, Rb, Cs, Fr
- NTK: lithium, sodium, potassium
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Alkaline earth metals
- Be, Mg, Ca, Sr, Ba, Ra
- NTK: magnesium, calcium, barium
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Pnictogens include:
- N, P, As, Sb, Bi, Uup (unconfirmed)
- NTK: nitrogen, phosphorous, arsenic, bismuth
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Chalcogens include:
- O, S, Se, Te, Po, Uuh
- NTK: oxygen, sulfur, selenium
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Halogens include:
- F, Cl, Br, I, At, Uus (unconfirmed)
- NTK: fluorine, chlorine, bromine, idodine
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Noble gases include:
- He, Ne, Ar, Kr, Xe, Rn
- NTK: helium, neon
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