Question

which elementshas two shells both of which are completely filled with electrons

Answer 1

Hola User________

Here is Your Answer...!!
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⭐Actually welcome to the concept of the ELECTRONIC CONFIGURATION...

⭐Basically here the The Duplet and the Octet of the of the elements should be filled up completely there fore

⭐The favourable elements are ...

⭐NEON

⭐ARGON

⭐CALCIUM

⭐KRYPTON

⭐XENON

⭐RADON

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Answer 2

two shell is completed filled with electron

means it's second element in noble gas group

i.e. neon

another way to get answer

two shell is completed filled with electron

i.e. K and L shell
K has 2 electron and L have 8 electron at most

total 10
neon have atomic number 10