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Helium has two neutrons and two protons in its nucleus.
If you build an atom using two protons, two neutrons and two electrons you would build an atom of Helium. To be more-precise, this would create Helium-4 the common isotope of Helium.
For example one atom of helium, one atom of argon etc.; all atoms contain a nucleus (formed from protons and neutrons) and a cloud of electrons.
If the atom has a balanced electrical charge, then # of protons = # of electrons, so the atom has 2 protons (Helium). The vast majority of Helium atoms have 2 neutrons.
There are several isotopes of Helium and they have different numbers of neutrons. The simplest and most common is Helium-4 which has two neutrons
Helium has two neutrons and two protons in its nucleus.
If you build an atom using two protons, two neutrons and two electrons you would build an atom of Helium. To be more-precise, this would create Helium-4 the common isotope of Helium.
The nucleus of a helium atom contains two protons and two neutrons.
For example one atom of helium, one atom of argon etc.; all atoms contain a nucleus (formed from protons and neutrons) and a cloud of electrons.
The nucleus of an atom contain protons and neutrons; protons and neutrons contain quarks and gluons.
The nucleus of a helium atom is composed of two protons and two neutrons. Alpha particles have the same composition as the nucleus of a helium atom.
If the atom has a balanced electrical charge, then # of protons = # of electrons, so the atom has 2 protons (Helium). The vast majority of Helium atoms have 2 neutrons.
There are several isotopes of Helium and they have different numbers of neutrons. The simplest and most common is Helium-4 which has two neutrons
In normal Helium(He) atom there are 2 electrons, 2protons and 2 neutrons.
The nucleus of a Helium atom contains two protons and two neutrons, protons and neutrons are measured in Daltons, and a Helium atom is about 4 Daltons
It is helium, specifically the helium-4 isotope, that is composed of two protons and two neutrons.
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.