8 Groups upto Calcium (Atomic Number -20)

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Representative elements are those elements whose inner shells are complete and whose outer shell (valency shell) has 1 to 7 electrons. They are also called normal elements.

Representative periodic table up to Ca with electronic configuration of elements

Group A	1A	2A	3A	4A	5A	6A	7A	0
Period 1	1H							2He
Period 2	3Li 2,1	4Be 2,2	5B 2,3	6C 2,4	7N 2,5	8O 2,6	9F 2,7	10Ne 2,8
Period 3	11Na 2,8,1	12Mg 2,8,2	13Al 2,8,3	14Si 2,8,4	15P 2,8,5	16S 2,8,6	17Cl 2,8,7	18Ar 2,8,8
Period 4	19K 2,8,8,1	20Ca 2,8,8,2

 From the above table it can be concluded that:

1. The elements present in same group have same number of valence electrons.

2. The total number of electron present in the valence shell of the representative elements indicates its group number.

3. The electrons are added across a period to the same outer shell from left to right.

4. The number of the period is equal to the total number of shells present in the atoms of that period.