Helium is an element with the atomic number two. It has two protons in its nucleus (which is why its atomic number is two), and it comes in two stable isotopes. The most abund…ant one, helium-4, has two neutrons, and helium-3, which has one neutron, is found as only about one atom in a million. The element helium is an inert or noble gas, and is found on the periodic table with the other inert gases in Group 18. They're the elements down the far right column of the table. Helium, which is the second most abundant element in the universe (behind hydrogen) is about a quarter of all matter.
http://www.answers.com/Q/What_is_an_antonym_for_helium
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What is the opposite of helium? A: A gas that has the opposite effect of helium on the human voice is xenon. Another gas that reverses the temporary high-pitched effect of inhaling helium is... Full Answer >
https://www.reference.com/science/color-helium-b7f66db1b3468675
Helium is a colorless and odorless gas in its natural state. It gives off a blue neon color when burned. When an electric current runs through it, helium is a pale peach to orange color. Helium is nonreactive and lighter than air, which makes it ideal for use in weather or decorative balloons. Helium is used to keep satellite instruments, spacecraft and MRI machines cool. After hydrogen, helium is the second-most abundant gas in the universe. It is present in all stars and has no known biological role. Helium is nontoxic and used by deep-sea divers at a rate of 80 percent helium and 20 percent oxygen.
https://www.reference.com/science/color-helium-b7f66db1b3468675
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A gas that has the opposite effect of helium on the human voice is  xenon. Another gas that reverses the temporary high-pitched effect of inhaling helium is sulfur hexafluoride. Both gases are more dense than air and magnify deep tones in the voice.
https://www.reference.com/science/opposite-helium-9a5183f787241bf2
Helium is an element with the atomic number two. It has two protons in its nucleus (which is why its atomic number is two), and it comes in two stable isotopes. The most abund … ant one, helium-4, has two neutrons, and helium-3, which has one neutron, is found as only about one atom in a million. The element helium is an inert or noble gas, and is found on the periodic table with the other inert gases in Group 18. They're the elements down the far right column of the table.
http://www.answers.com/Q/What_is_an_antonym_for_helium
what is the opposite of helium
A gas that has the opposite effect of helium on the human voice is xenon.