Atomic radii and ionization energy

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Atomic radii and ionization energy

Postby Enzo_1I » Sun May 06, 2018 9:04 pm

Why does atomic radii decrease across a period, while ionization increases across a period ?

Heung Ching Chia 1E
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Joined: Mon Apr 09, 2018 1:38 pm

Re: Atomic radii and ionization energy

Postby Heung Ching Chia 1E » Sun May 06, 2018 9:15 pm

Atomic energy decreases across a period because there will be constantly an addition of 1 proton versus an addition of 1 electron, and the strength of the pull of the proton on the electrons (electrostatic attraction) will outweigh the electron repulsion between electrons, hence, the radius of an atom increases across the period.

Ionization energy increases across the period because ionization energy is basically the energy required to remove an electron from the atom. If the atomic radii decreases across the period, it means the nuclear charge (+ve pull on electrons by nucleus) increases across the period and pulls the electrons closer to the nucleus, making it harder to remove an electron. Therefore, ionization energy increases across the period in general.

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