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Noble Gases

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Question

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do all elements labelled in periodic table have exactly one electron in the outermost energy level or shell
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Solution

No .

Oxygen atomic no -8
Electronic configuration 2,6
It has 6 electrons in the outer most shell

Chlorine- 17
Electronic configuration 2,8,7
It has 7 electrons in the outer most shell

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Q. Good evening mentor
define electronic configuration
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Q. Good evening mentor
what about the number of electrons housed in first shell and second shell
Are they fixed with the number 2,8 respectively
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State whether true or false :

All the elements having one electron in their outermost shell are metals.

How many electrons do the following elements have in their outermost shells?

Q. PERIODIC CLASSIFICATION OF ELEMENTS-Why are atomic numbers 27-36 in the fourth period of the Modern Periodic Table, even though only elements with the same number of electronic 'shells' are arranged in the same period(atomic numbers 19-26 have 4 shells and the rest in period 4 have 5 shells)?

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