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- Choose the correct option:Option: 1 The period of the element is determined by its highest shellOption:
- #Chemistry
- #Classification of Elements and Periodic table
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- #Engineering
- #Joint Entrance Examination Main
Choose the correct option:
The period of the element is determined by its highest shell
The period of the element is determined by its last orbital
The period of the element is determined its valence shell electrons
The period of the element is determined by its valency
Answers (1)
How to find Group, Periods and Blocks of any element -
Period
The period of any element is determined by the last shell in which the last electrons enters. For example, Fe has atomic number is 26. The electronic configuration can be written as:
1s22s22p63s23p64s23d6
Now, the last electron enters into the d-subshell and shell is 3. Therefore, Fe belongs to third period.
Block
The block of any element is determined by the last subshell in which the last electron enters. For example, Na has atomic number 11, thus its electronic configuration can be written as:
1s22s22p63s1
Now, its last electron enters into the s-subshell, therefore, Na belongs to the s-block.
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The period of the element is determined by its highest shell.
Therefore, Option(1) is correct
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