Which of the following elements is the smallest?A.Magnesium (Mg)B.Strontium (Sr)C.Beryllium (Be)D.Calcium (Ca)SUBMITarrow_backPREVIOUS
Question
Which of the following elements is the smallest?
A. Magnesium (Mg)
B. Strontium (Sr)
C. Beryllium (Be)
D. Calcium (Ca)
SUBMIT
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Solution
The size of an atom is determined by its atomic radius. The atomic radius decreases across a period from left to right and increases down a group in the periodic table.
Looking at the elements given:
A. Magnesium (Mg) is in Period 3, Group 2. B. Strontium (Sr) is in Period 5, Group 2. C. Beryllium (Be) is in Period 2, Group 2. D. Calcium (Ca) is in Period 4, Group 2.
Since all these elements are in the same group (Group 2), we can determine their size based on their period. The element in the highest period will be the largest, and the element in the lowest period will be the smallest.
Therefore, Beryllium (Be), which is in Period 2, is the smallest element among the given options.
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