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Which alkaline earth metal has the smallest atomic radius?
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2. Atoms and the Periodic Table
Periodic Trend: Atomic Radius (Simplified)
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Arrange the following atoms in order of decreasing atomic radius:Sr, Se, Ne, Ga
A
Ne > Se > Ga > Sr
B
Ga > Se> Ne > Sr
C
Sr > Ga > Se > Ne
D
Se > Ne > Ga > Se
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Understand that atomic radius generally decreases across a period from left to right and increases down a group in the periodic table.
Identify the position of each element in the periodic table: Strontium (Sr) is in Group 2, Period 5; Gallium (Ga) is in Group 13, Period 4; Selenium (Se) is in Group 16, Period 4; Neon (Ne) is in Group 18, Period 2.
Recognize that elements in the same period will have decreasing atomic radii as you move from left to right due to increasing nuclear charge pulling electrons closer.
Compare elements across different periods: Sr is in a lower period than Ga and Se, indicating a larger atomic radius due to additional electron shells.
Arrange the elements in order of decreasing atomic radius based on their positions: Sr (largest) > Ga > Se > Ne (smallest).
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