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The number of elements in the second period of the periodic table is 

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Important Questions on Periodic Classification of Elements

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Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 30

Which of the given elements A, B, C, D, and E with atomic number  2, 5. 9,10, and 35 respectively belong to same period?

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Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 31
The elements P, Q, R, and S have the atomic numbers 11, 15, 19, and 26 respectively. Which pair of elements belong to the same group.
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Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 32
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
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Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 33
According to Mendeleev's Periodic Law, the elements are arranged in the Periodic Table in the order of 
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Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 34
The number of elements in each of the long periods is 
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Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 35
What type of oxide would Eka-aluminium form?
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Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 36
The elements of the group18 are called
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Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 37
Arrange the following elements in the order of their increasing non-metallic character Li, O, C, Be, F.