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What is the element with the least atomic mass is hydrogen or helium?
Hydrogen's atomic mass (1 amu for the most stable isotope) is less than that of helium (4 amu).
Which element is the least atomic mass?
Hydrogen.
Does hydrogen or helium have the least atomic mass?
Hydrogen has the lowest atomic mass of all the elements. Hydrogen has one proton and one electron. Helium, two neutrons, two protons and two electrons.
Which has the least number of atoms 5g of hydrogen or 10g of helium?
10g of helium has fewer atoms. This is because the atomic mass of helium is much higher than that of hydrogen, so the same mass of helium contains fewer atoms than the same mass of hydrogen.
Is hydrogen the lightest element on the periodic table?
hydrogen has the least mass of all the elements, so yes in a way, it is.
Does magnesium have a smaller radius than helium?
Atoms do not have a radius. A helium atom has a nucleus composed of at least two protons and maybe one or two neutrons. A magnesium atom nucleus (and every other atom on the periodic table other than hydrogen) is BIGGER than a helium nucleus. So if you look at it that way...magnesium is larger than helium
How are helium and hydrogen different?
Hydrogen and helium, both gasses, differ greatly in:the number of protons and electrons (1 or 2),the number of neutrons (0 or 2),their Atomic Mass 1.0 or 4.0 ,and not at least in their reactivity (highly explosive or inert).
Is a helium atom larger than a neon atom?
helium as it contains 2 protons, while hydrogen only contains 1. Additionally, the orbit of the 2 electrons in a neutral helium atom would also be larger than the orbit of the single electron in hydrogen.
What element has the lowest density of all of the elements?
The element which has been measured to have the lowest density is hydrogen. Not only is hydrogen the least dense element, it is also the most plentiful on earth.
What are the three lightest noble gases?
Technically Helium is classed as a Noble gas and has a MW of 4g/mol.
Which is the least dense?
Helium is the least dense element at normal conditions.
Which is the following location in the periodic table would have the least massive atom?
Hydrogen is the least massive element. It is found in group 1, period 1 on the periodic table.
