Valency of an element is defined as the combining power of element. As, the number of electrons gained or lost or shared with other atoms in the formation of compounds.
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5.
Gallium was named by Mendeleev as
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6.
What are magic numbers?
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7.
Which property is the basis of long form of periodic table?
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8.
How many elements are placed in each period of the p-block?
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9.
What is the number of groups in: (i) p-block (ii) d-block?
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10.
How many elements are present in: (i) second period (ii) fourth period (iii) sixth period?
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