Can you estimate?

Chemistry Level 2

The above is the diagram of a helium atom, showing the electron probability density as shades of gray. The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the nucleus to the boundary of the surrounding cloud of electrons. By the way, Lithium ( 3 _3 Li), Beryllium ( 4 _4 Be), Boron ( 5 _5 B) and Carbon ( 6 _6 C) have the same number of electron shells but different atomic radii. Which one has the largest atomic radius?

Lithium ( 3 _3 Li) Beryllium ( 4 _4 Be) Boron ( 5 _5 B) Carbon ( 6 _6 C)

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Lakshan Dumpa by Lakshan Dumpa , 24, India

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5 solutions

Sriram Rf Maestro
Oct 16, 2014

atomic number and atomic radius is inversely proportional .in this case lithium has less atomic number so it has larger radius

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Muhammad Hamza
Jul 25, 2014

with the increase of atomic number the electron cloud is pulled with greater attractive force towards nucleus due to which atomic radius decrease with increase of atomic number

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I figured it out by hypothesizing that for elements of the same period (same number of electron shells), elements on the right have more protons and electrons and have stronger attraction force reducing the atomic radii.

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Dang Anh Tu
Jun 3, 2014

Another tip for you guys to answer this question: In the same period, from left to right, the atomic radius will decrease In the same group, from top to bottom, the atomic radius will increase! (P.S.: This tip brought me mark 10 in Chemistry test last semester!)

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Zoya Anjum
Mar 16, 2014

With increasing number of protons, the force by which it attracts the electrons increases resulting in comparatively smaller radius.

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