4 years ago

Can someone help me please

1 answer:

4 0

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Troyanec [42]

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rosijanka [135]

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ELEN [110]

Answer:

Outer shell is full

Explanation:

The elements represented by the group D are noble gases.

Noble gases have fully filled outer electronic configuration.

He= $1s^2$

Ne= $1s^22s^2 2p^6$

Ar= $1s^22s^2 2p^63s^2 3p^6$

Kr= $1s^22s^2 2p^63s^2 3p^63d^{10} 4s^2 4p^6$

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3 years ago