Periods
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Groups
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i.
The horizontal rows of elements in the modern periodic table are called as
periods.
ii.
There are seven periods in the modern periodic table.
iii.
The period number indicates the number of electronic shells present in an
atom of every element belonging to that period.
iv.
Elements show gradual variation in chemical properties along a period.
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i.
The vertical columns of elements in the modern periodic table are called as
groups.
ii.
There are eighteen groups in the modern periodic table.
ii.
There are eighteen groups in the modern periodic table.
iii.
The group number indicates the number of electrons in the outermost shell of
an atom of every element belonging to that group.
iv.
Elements belonging to a particular group show strong resemblance in their
chemical properties.
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Periods Groups
