Cnolteb5663
17.12.2021 •
Chemistry
24. Which is the correct symbol for this atom?
21
a. 11 F b. 1,
c. They
d.
21
18
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Ответ:
This is the only option that correctly describe characterisitics of noble gases.
All noble gases have a unique atomic fingerprint.
All noble gases have valence shells with 8 electrons but Heilum has only 2 valence electrons.
And all noble gases do not easily react with other elements as they have their outermost shell completly filled so they are highly stable.
All noble gases emits different colored light when electrified.