객관식
Which of the following element symbols correctly represents the element potassium on the periodic table?
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2. Atoms & Elements
Periodic Table: Element Symbols
객관식
Which noble-gas symbol is used in the noble-gas electron configuration for tin (Sn)?
A
Ne
B
Kr
C
Ar
D
Xe
검증된 단계별 안내1
Identify the atomic number of tin (Sn), which is 50. This tells us how many electrons tin has in its neutral state.
Recall that noble-gas electron configurations use the symbol of the noble gas that precedes the element to represent the core (inner) electrons, simplifying the full electron configuration.
List the noble gases in order with their atomic numbers: He (2), Ne (10), Ar (18), Kr (36), Xe (54), Rn (86).
Determine which noble gas has an atomic number less than tin's 50 but is closest to it. This noble gas will be used in the noble-gas shorthand configuration for tin.
Conclude that since krypton (Kr) has an atomic number of 36, which is less than 50 and closest among the options, the noble-gas symbol used in tin's electron configuration is Kr.
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