Textbook Question
Give the symbol of the element that has the (4.7)b. largest atomic size in Period 4
9. Electrons in 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
Verified step by step guidance1
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: Sr (Strontium) is in Group 2, Period 5; Ga (Gallium) is in Group 13, Period 4; Se (Selenium) is in Group 16, Period 4; Ne (Neon) is in Group 18, Period 2.
Recognize that Sr is further down the periodic table compared to Ga, Se, and Ne, indicating a larger atomic radius due to more electron shells.
Compare Ga and Se, which are in the same period (Period 4). Ga is to the left of Se, meaning Ga has a larger atomic radius than Se.
Ne is in Period 2, which is higher up the periodic table compared to the other elements, indicating it has the smallest atomic radius due to fewer electron shells.
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