Scelta multipla
The atomic radius of main-group elements generally increases down a group because ________.
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10. Periodic Properties of the Elements
Periodic Trend: Atomic Radius
Scelta multipla
Rank the following elements in order of decreasing atomic radius: Na, Mg, Al, Si.
A
Al > Si > Na > Mg
B
Si > Al > Mg > Na
C
Mg > Na > Al > Si
D
Na > Mg > Al > Si
Guida verificata passo dopo passo1
Recall that atomic radius generally decreases from left to right across a period in the periodic table due to increasing nuclear charge pulling electrons closer to the nucleus.
Identify the position of each element (Na, Mg, Al, Si) in the periodic table: all are in period 3, with Na in group 1, Mg in group 2, Al in group 13, and Si in group 14.
Understand that since all elements are in the same period, the atomic radius decreases as you move from left (Na) to right (Si) because the number of protons increases, increasing the effective nuclear charge and pulling electrons closer.
Therefore, the order of decreasing atomic radius should start with the element furthest to the left (Na) and end with the element furthest to the right (Si).
Conclude that the correct ranking of atomic radius from largest to smallest is: Na > Mg > Al > Si.
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