Regular hydrogen.
hydrogen-2, is usually called deuterium
Deuterium.
Deuterium
As a collective groupo , they form the nucleus of an atom.
The number of nucleons in an atom can vary. A nucleon is either of the two components that make up an atomic nucleus. That's either a proton or a neutron. Different atoms have different numbers of nucleons, and even different atoms of a given element can have different numbers of nucleons (because of isotopic variation). Let's look an a couple of examples to make our point.In hydrogen-1, which is the simplest and most common form of hydrogen, there is one proton in the nucleus of the atom. It has 1 nucleon. In hydrogen-2, there are a proton and a neutron in the nucleus, and that's 2 nucleons. In hydrogen-3, there are a proton and two neutrons in that nucleus, and that's 3 nucleons. In helium-3, there are two protons and a neutron in the nucleus, and that's 3 nucleons. You can see what's happening if you think it through.
Outside the nucleus, free neutrons are unstable and have a mean lifetime of 885.7±0.8 s (about 15 minutes), decaying by emission of a negative electron and antineutrino to become a proton: : n0 → p+ + e− + νe
Electron
Almost all of the mass of an atom is in the nucleus. The nucleus is made up of protons and neutrons, with hydrogen-1 as the lone exception because its nucleus has only a proton in it. In other atoms, protons and neutrons are fused together to form that nucleus. The electrons are out in their electron cloud. And we mention the electron because it has only about 1/1836th the mass of a proton. See how it works? A fistful of electrons weigh almost nothing compared to a single proton. The neutron is slightly heavier than a proton, so when neutrons and protons are gathered in any atomic nucleus, it contains most all of the mass of that atom.
The basic difference is a neutron. Most hydrogen has a single proton for a nucleus. Hydrogen-2 has a neutron stuck to the proton, and hydrogen-3 has two neutrons stuck to the proton. Hydrogen-3 is a rare and highly unstable form of the first element.
As a collective groupo , they form the nucleus of an atom.
Electron capture is the absorption of an electron by an atomic nucleus if that nucleus is neutron poor. An electron is captured, usually from an inner electron shell of that atom, and it will convert a proton in the nucleus into a neutron. We know that a neutron is converted into a proton and an electron in neutron decay, so it might be looked at as something of an opposite nuclear reaction where a proton and an electron combine to form a neutron.
The nucleus of an atom is made up of protons and neutrons.
An atom is made up of protons, neutrons and electrons. The protons and neutrons form a nucleus where the majority of the mass is; the electrons are in orbit around the nucleus.
You are an atom of heavy hydrogen, or deuterium. Most hydrogen has one proton and one electron, which form a neutral atom. But once in a while, a neutron will stick to the proton, and then the atom, which is still hydrogen (it has just the one proton) will be about twice as massive as "regular" or "common" hydrogen. It is another isotope of hydrogen called heavy hydrogen or deuterium.
The most common form of Hydrogen, forming more than 99.9% of all hydrogen atoms in the universe, (sometimes known as Hydrogen-1) has one proton in the nucleus and one electron ( with no neutrons ). There are, however, other forms (isotopes) of hydrogen that can be stable, such as Hydrogen-2 ( also known as deuterium ), which has one neutron and one proton in the nucleus as well as one electron.
The number of nucleons in an atom can vary. A nucleon is either of the two components that make up an atomic nucleus. That's either a proton or a neutron. Different atoms have different numbers of nucleons, and even different atoms of a given element can have different numbers of nucleons (because of isotopic variation). Let's look an a couple of examples to make our point.In hydrogen-1, which is the simplest and most common form of hydrogen, there is one proton in the nucleus of the atom. It has 1 nucleon. In hydrogen-2, there are a proton and a neutron in the nucleus, and that's 2 nucleons. In hydrogen-3, there are a proton and two neutrons in that nucleus, and that's 3 nucleons. In helium-3, there are two protons and a neutron in the nucleus, and that's 3 nucleons. You can see what's happening if you think it through.
Outside the nucleus, free neutrons are unstable and have a mean lifetime of 885.7±0.8 s (about 15 minutes), decaying by emission of a negative electron and antineutrino to become a proton: : n0 → p+ + e− + νe
They are collectively known as nucleons, and together, all of them form the nucleus of an atom.
The pair form a hydrogen atom.There is a fallacy that's taught about this pairing, which is that the electron-proton pair form a neutron. See my answer to the question "What particle has the same mass as a hydrogen atom?" for more details about this, and why it is wrong.
Every nucleus (except for Hydrogen) consists of protons and neutrons. The hydrogen nucleus is only a proton.