Helium is an atom. Heavier elements have molecules.
Helium molecule is mono atomic. 1 mole = 6.023 x 1023 atoms of helium So, 2.5 moles = 2.5 x 6.023 x 1023 atoms of helium or 15.058 x 1023 atoms of helium
No. First consider two helium atoms, each has two electrons spin-paired in a filled 1s shell, for a total of 4 electrons. Now construct the molecular orbitals that a diatomic helium molecule would contain. To do so, you combine both 1s orbitals from the individual atoms. Combining two atomic orbitals gives two molecular orbitals (by orbital conservation). The in-phase overlap gives the bonding orbital (sigma 1s) and out-of-phase overlap gives the anti-bonding orbital (sigma* 1s). Filling in the two molecular orbitals from low energy to high energy (aufbau principle) populates the simga with two electrons and the sigma* with two electrons. Because the energy of the sigma and sigma* orbitals are equal, but opposite in sign, there is no net bond stabilization. I.e. no physical reason for Helium atoms to exist as diatomic molecules.
Yes helium is an atom. It is stable. It is placed in group 18.Yes, helium is a monoatomic molecule. It is stable itself as it has already achieved maximum possible electrons in its outermost shell. It is the only element in group 18 without 8 electrons in valence shell.
The symbol of Helium is He. Helium's atomic number is 2.
The symbol for hydrogen is H, and the symbol for helium is He.
When two helium atoms combine, they form a molecule of helium gas (He2), which is also known as a dihelium molecule. This molecule is quite rare and unstable under normal conditions, as helium typically exists as a monoatomic gas.
Helium is an element.
Helium is monoatomic.
ONE, Helium is an element, not a molecule.
A molecule of helium is composed of two helium atoms.
Helium is monoatomic.
Helium is a chemical element, not a compound; also helium is monoatomic.
Helium does not form molecules but exists as individual atoms.
helium is an element, it is a mono atomic molecule, He2 .
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