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Most helium has a mass number of 4. The rare 3He isotope has a mass number of 3.
The mass number is the integer total of protons and neutrons for a given isotope. For example radioactive carbon-14 has a mass number of 14, while carbon-12 (the most common stable form) has a mass number of 12.
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoThe mass number of Helium-4 is 4 I think. Add up the protons and neutrons to get the Atomic Mass.
Wiki User
∙ 9y agoHelium is a non metal element. Atomic mass of it is 4.
Wiki User
∙ 11y ago4 because the mass number equals protons plus neutrons. Which is 4.
Wiki User
∙ 13y agoNo, the atomic number for Helium is 2. The average atomic mass is 4.
Wiki User
∙ 6y ago1 mole He has a mass of 4.00, so 4 moles has a mass of 16.00
Wiki User
∙ 14y agoThe atomic number of Helium is 2.
Wiki User
∙ 12y ago4
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What is heliums specific gravity?
helium doesn't have a specific gravity
What state of matter is Helium?
gas is heliums only state of matter
In order to calculate the number of neutrons you must subtract the from the?
Number of neutrons = Mass number - atomic number
The mass number of an element is the number of?
Mass number is the atomic mass of a particular isotope (apex chem 5.3)
Can you use the mass number of an element to determine the number of electrons in an atom?
Mass number = number of protons + number of neutrons Number of electrons = number of protons = mass number of an isotope - number of neutrons
What is heliums number of valence electrons?
Helium has 2 valence electrons.
Is hydrogens atomic number greater than heliums?
Hydrogen has atomic number 1 whereas helium's is 2.
What is heliums oxidation number?
Helium does not form any known stable compounds, and thus it is nearly always in the 0 oxidation state.
What is heliums normal phase?
liquid, and gas.
What is heliums odor?
Helium is an odorless gas.
What is heliums chemical state?
gaseous state.
What is heliums chemical?
Helium's chemical symbol is He.
What is heliums boiling temprature?
-268.93 °C
How many times lighter is a helium atom than carbon?
A helium-4 atom is just about 1/3 the mass of a carbon-12 atom.
What is heliums appereance?
helium is a colourless odourless gas
What is heliums room temperatures?
Helium is a gas at room temperature.
What is heliums specific gravity?
helium doesn't have a specific gravity
