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Which of the following is a two-letter chemical symbol for an element on the periodic table?
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2. Atoms & Elements
Periodic Table: Element Symbols
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Which of the following element symbols represents the lightest noble gas?
A
Ne
B
Kr
C
He
D
Ar
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Recall that noble gases are elements in Group 18 of the periodic table, known for their full valence electron shells and chemical inertness.
Identify the atomic numbers of the given noble gases: He (Helium) has atomic number 2, Ne (Neon) has atomic number 10, Ar (Argon) has atomic number 18, and Kr (Krypton) has atomic number 36.
Understand that the lightest element corresponds to the one with the smallest atomic number because atomic number represents the number of protons and generally correlates with atomic mass.
Compare the atomic numbers of the given noble gases to determine which has the lowest value.
Conclude that the noble gas with the smallest atomic number (and thus the lightest) is He (Helium).
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