helium is preferred to hydrogen for filling balloons because it is
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because helium is a neon gas and this gas is stable
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ʏᴏᴜʀ ᴀɴsᴡᴇʀ ɪs ᴛʜᴇ ᴀᴛᴛᴀᴄʜᴍᴇɴᴛ
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