Question

(7) Write symbol of electron distribution in the shell of flourine atom?
Ans.
*(8) Which is the outermost shell of flourine atom?
Ans.
* (9) Which is the outermost shell of sodium atom?
Ans.
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* (10) Which is the outermost shell of hydrogen atom?​

Answer 1

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(7)E is considered as the symbol of electron distribution in shell of fluorine atom.

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(8)The number of electrons that an atom must acquire, or lose, or share to reach a stable configuration of 8 (2 for hydrogen) is called its valence. Hydrogen, lithium, sodium, and potassium atoms all have a single electron in their outermost shell.2

The last electrons in the configuration settle in shell number 2, thus shell number 2 is the outermost shell and so is called thevalence shell. By definition, valence electrons are the electrons located at the outermost shell of an atom.

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(9)The outermost shell of the sodium ion is the second electron shell, which has eight electrons in it.

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(10)The number of electrons that an atom must acquire, or lose, or share to reach a stable configuration of 8 (2 for hydrogen) is called its valence. Hydrogen, lithium, sodium, and potassium atoms all have a single electron in their outermost shell.