Noble gas: ke revisions ke biich ke antar
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Rekha 1:
'''Noble gases''', [[gas]] ke ek roup hae. Ii sab element [[periodic table]] ke group 18 me hae. Ii sab gas duusra element se jaada kar ke react nai hoe hae kaahe ki iske bahaar waala cell electron se bharaa rahe hae. Chhe noble gas hae:
* [[helium]]
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