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CBSE Class 10 Answered

which one has bigger atomic size?: chlorine or lithium ? explain the reason!
Asked by Deepshikha deepak | 26 Dec, 2013, 09:09: PM
answered-by-expert Expert Answer
  • The size of an atom is measured by it's covalent radius.
  • As we go across the period the nuclear charge (charge on the atom) increases, also outermost electrons occupy the same principle energy.
  • The size of chlorine decreases because there are more protons in its nucleus but the electrons are  all in the same orbit so they are pulled closer to the nucleus so the size is smaller.
  • The electrons in chlorine are held more closely and tightly together than that of lithium, so lithium has a larger atomic radius.
  • The lithium atom has a smaller nuclear charge than chlorine, hence lithium has a larger covalent radius.
Answered by Prachi Sawant | 27 Dec, 2013, 10:15: AM

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