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 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.
Why is DNA copying an essential part of the process of reproduction?
DNA copying is an important process that ensures that when cell multiplies, through the mechanisms of mitosis or meiosis, equal amount of DNA (genetic material) passes in to the new cell. DNA is copied so that the amount of DNA remains constant in the daughter cells.
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