What are the characteristics of a period table
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THE CHARACTERISTICS OF MODERN PERIODIC TABLE
⇒The arrangement of elements in modern periodic table is based on their electronic configurations.
⇒The horizontal rows of elements in periodic table are called periods.
⇒There are 7 periods in modern periodic table.
⇒The elements in a period have consecutive atomic numbers. Example : in period 2 we have elements Li, Be, B, C, N, O, F and Ne having atomic no. 3 ,4 ,5 ,6 ,7 ,8 ,9 and 10.
⇒The vertical columns in a periodic table are called groups.
⇒There are 18 groups in modern periodic table.
⇒The elements in a group do not have consecutive atomic numbers. Example : in a group 2 we have elements Be ,Mg ,Ca ,Sr ,Ba and Ra with atomic no. 4 ,12 ,20 ,38 ,56 and 88.
⇒In the periodic table, metals have been separated from non- metals by some elements called “metalloids”.These metalloids are Boron(B), Silicon(Si), Germanium (Ge), Arsenic(As), Antimony(Sb), Tellurium(Te), and Polonium(Po).
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The horizontal rows of elements in periodic table are called periods. There are 7 periods in modern periodic table. The elements in a period have consecutive atomic numbers. Example : in period 2 we have elements Li, Be, B, C, N, O, F and Ne having atomic no.