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22/11/2020 10:40 am
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The elements of the third period of the Periodic Table are given below:
Group - I - II - III - IV - V - VI - VII
Period 3 - Na - Mg - Al - Si - P - S - Cl
(a) Which atom is bigger, Na or Mg? Why?
(b) Identify the most (i) metallic and (ii) non-metallic element in Period 3.
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22/11/2020 10:41 am
(a) Sodium is bigger than magnesium as it has lesser nuclear charge so there is less force of attraction between nucleus and valence electrons and less effective nuclear charge. It is, therefore, bigger in size.
(b) (i) Sodium is the most metallic as it can lose electrons easily due to its larger atomic size.
(ii) Chlorine is the most non-metallic element because it can gain electrons easily due to its smallest atomic size.