Multiple Choice
Which properties of gallium was Mendeleev able to predict before its discovery?
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
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Which of the following elements is in the same period as phosphorus?
A
Calcium
B
Sulfur
C
Magnesium
D
Argon
Verified step by step guidance1
Identify the period number of phosphorus on the periodic table. Phosphorus (P) is located in period 3.
Recall that elements in the same period have the same principal energy level (same row in the periodic table).
Check the period numbers of the given elements: Calcium (Ca) is in period 4, Sulfur (S) is in period 3, Magnesium (Mg) is in period 3, and Argon (Ar) is in period 3.
Compare each element's period with phosphorus's period to find which elements share the same period.
Conclude that Sulfur, Magnesium, and Argon are in the same period as phosphorus, but Calcium is not.
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