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Write the electronic configuration of the element with atomic number 17. Indicate the valency of the element.
The atomic number is 17
The no. of protons and no. of electrons is 17.
The electronic configuration is:
K L M
2 8 7
The outermost orbit has 7 electrons.
In order to make it 8, the element will have to gain 1 electron. So, the valency of the element is 1.
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