Periodic trends answers

1. (a) Chlorine has 7 electrons in the third energy level and sodium only has one. The seventeen protons in the nucleus of the chlorine atom attract the energy level more strongly than the eleven protons in the sodium atom thus making the chlorine atom smaller.(b) The outer electrons are further away from the nucleus as they are in successively higher energy levels.2. Atomic radii are normally obtained by measuring half...

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