Page 5 - 3. Lesson Note Ch-5 MODERN PERIODIC TABLE

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1 group: Alkali metals are placed in the 1st group in the modern periodic table.
Exception- Hydrogen is also placed in the 1st group although hydrogen is not an
alkali metal.

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2 group: Alkaline earth metals are placed in the 2nd group in the modern
periodic table.

Elements placed in 1st and 2nd groups in the modern periodic table are
collectively known as light metals.

rd
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3 to 12 group: Transition elements are placed from 3rd to 12th group in the
modern periodic table.
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13 group: Metals are placed in the 13th group;
Exception - boron which is a metalloid.

14 group: Carbon, silicon, germanium, tin and lead are placed in this group.
th
Among them, -
▪ carbon is a non-metal,
▪ silicon and germanium are metalloids and
▪ tin and lead are metals.

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15 group: Nitrogen, phosphorous, arsenic, antimony and bismuth are place in
the 15th group; among which –
▪ nitrogen and phosphorous are non-metals,
▪ arsenic and antimony are metalloids and
▪ bismuth is a metal.

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16 group: Oxygen, sulphur, selenium, tellurium and polonium are placed in
this group, among which –
▪ oxygen, sulphur and selenium are non-metals,

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