Short Answer Type(i) How do you calculate the possible valency of an element from the electronic configuration of its atoms?
(ii) Calculate the valency of element X whose atomic number is 9.
On the basis of electronic configuration, how will you identify the first and the last element of a period?
The element is said to be in the first element of a period if the number of valence electron is 1. If the number of valence electron is 8, the element is said to be the last element of a period.
The stars appear higher from the horizon than they actually are. Explain why it is so.
Write any two differences between binary fission and multiple fission in a tabular form as observed in cells of organisms.
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