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Which of the following is the atomic number of the second noble gas in the periodic table?
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2. Atoms & Elements
Periodic Table: Group Names
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Which of the following elements has the same number of energy levels (electron shells) as sodium (Na)?
A
Magnesium (Mg)
B
Potassium (K)
C
Chlorine (Cl)
D
Calcium (Ca)
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Identify the period (row) of sodium (Na) in the periodic table. Sodium is in period 3, which means it has 3 energy levels (electron shells).
Recall that the number of energy levels corresponds to the period number of the element in the periodic table.
Check the period of each given element: Magnesium (Mg), Potassium (K), Chlorine (Cl), and Calcium (Ca).
Determine which elements are also in period 3, meaning they have the same number of energy levels as sodium.
Conclude that elements in period 3, such as Magnesium (Mg) and Chlorine (Cl), have the same number of energy levels as sodium.
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