4.002602 g/mol
Hydrogen. It's first on the periodic table, with usually a sigle proton, and an atomic weight of 1.00794.
The symbol of Helium is He. Helium's atomic number is 2.
The lightest weight element that is not a gas at room temperature is lithium. It is a solid metal with a low density and atomic number 3.
Atomic number 2 corresponds to the element Helium. Helium has 2 protons in its nucleus, making it the second element on the periodic table. It is a colorless, odorless gas and is the second most abundant element in the universe.
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Helium's atomic weight = 4 amu
Helium atom has 2 protons and 2 neutrons (that accounts for its atomic weight). The atomic weight of helium is 4.00260
The atomic weight of helium is 4,002602(2).
Helium has a standard atomic weight of 4.0026 atomic mass units (amu).
You subtract the atomic number from the atomic weight. For example, if you have a helium atom and its atomic weight is 4 and you subtract its atomic number (2) the number of neutrons in the helium atom is 2.
You subtract the atomic number from the atomic weight. For example, if you have a helium atom and its atomic weight is 4 and you subtract its atomic number (2) the number of neutrons in the helium atom is 2.
The only element helium makes up is helium. Atomic number: 2 Atomic weight 4.00260 u (avg)
hydrogen
Helium is the second lightest element on the periodic table, with an atomic number of 2 and an atomic weight of approximately 4.0026 atomic mass units.
The biggest jump in atomic weights between consecutive elements on the periodic table occurs between hydrogen (H) and helium (He). Hydrogen has an atomic weight of approximately 1.008, while helium has an atomic weight of approximately 4.0026. This significant increase is due to the addition of a neutron in the helium nucleus, which contributes to its higher atomic weight.
The density of helium is approx. 0,9 g/L.
Helium has atomic number 2. That means the helium atom has 2 protons and two electrons. The standard atomic weight of helium is 4.002602, or 4.003 rounded to 3 decimal places.