Because they have a full outer shell and they are both noble gases...Because the outer shell has attained stable electronics configuration of octate rule this it is with noble gas as helium.
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Inner planets are rockier and outer planets are gaseous. Hope this helps! Can I have brainliest please
Isotopes are atoms of the same element that have different numbers of neutrons.
English<span>Сгорело 6 г угля С. Вычислите массу образовавшегося оксида углерода (IV)
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