Multiple Choice
What is the typical ionic charge of halogens when they form ions?
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2. Atoms & Elements
Periodic Table: Charges
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Which element has the same number of energy levels (principal energy shells) as lithium?
A
Beryllium
B
Sodium
C
Neon
D
Magnesium
Verified step by step guidance1
Recall that the number of energy levels (principal energy shells) in an atom corresponds to the period (row) of the element in the periodic table.
Identify the period of lithium (Li) in the periodic table. Lithium is in period 2, which means it has 2 principal energy levels.
Check the periods of the other elements given: Beryllium (Be), Sodium (Na), Neon (Ne), and Magnesium (Mg).
Determine which of these elements are also in period 2, meaning they have the same number of energy levels as lithium.
Conclude that the element in period 2, and thus with the same number of energy levels as lithium, is Beryllium.
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