Answer :
Final answer:
Helium is classified as a nonmetal and is the first noble gas in Group 18 of the periodic table. Its filled valence shell contributes to its low reactivity, making it exist primarily as single, unbonded atoms. This elemental classification highlights helium's distinct characteristics compared to metals and metalloids.
Explanation:
Helium: A Noble Gas
Helium (He) is a noble gas located in Group 18 of the periodic table. Unlike metals or metalloids, helium is classified as a nonmetal due to its unique properties. Noble gases, such as helium, are characterized by their filled valence shells, which make them extremely nonreactive and exist primarily as single atoms.
Here are some key points about helium:
- Helium has an atomic number of 2, meaning it contains 2 protons and typically 2 electrons.
- It is the least reactive element and does not form compounds with other elements.
- Helium is used in various applications such as in balloons, for gas chromatography, and in cryogenics.
In summary, helium is unequivocally a nonmetal and stands out as the first of the noble gases in the periodic table.
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