A mixture: The walls of the balloon are not made of helium, and helium itself never reacts with any elastomeric material suitable for constructing balloons.
Helium is an element (and therefore a pure substance) yes
In theory it is a pure element. However, due the the cost of obtaining really pure helium, it is likely to contain trace amounts of other gases.
Helium is a chemical element, not a compound; also helium is monoatomic.
NO!!!! He (Helium) is monatomic gas, that is it exists as single atoms, and does NOT combine with any other substance to form a compound. 'He' is the most inert element of all. It alsao has the lowest condensing point 4K4 (-269 oC) and freezing point at 2K (-271oC).
No, helium is not a compound. It is a monatomic gas, meaning it consists of single atoms of helium.
No, helium inside a balloon is not a compound. Helium is a chemical element and is the second lightest element on the periodic table. It exists as individual helium atoms inside the balloon.
It is a element
Helium is an element and not a compound or mixture.
Helium is an element.
It is a element
Neither. Helium is an element
It is a element
Helium is an element. It is in the 18th group of the periodic table. It is a noble gas.
Helium is an element (and therefore a pure substance) yes
Neither. Helium is a noble gas mono atomic element.
Helium is an element. It is a noble gas. It is in the 18th period.
In theory it is a pure element. However, due the the cost of obtaining really pure helium, it is likely to contain trace amounts of other gases.