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Helium has 2 protons and electrons in its structure. The total number of neutrons in the nucleus of an atom is called the neutron number. Typical isotopes of helium are helium-4 and helium-3.
- Lithium
Protons and Neutrons in Lithium. Lithium is a chemical...
- Lithium
These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). Atomic numberThe number of protons in an atom. Electron configurationThe arrangements of electrons above the last (closed shell) noble gas.
Even though electrons, protons, and neutrons are all types of subatomic particles, they are not all the same size. When you compare the masses of electrons, protons, and neutrons, what you find is that electrons have an extremely small mass, compared to either protons or neutrons.
Atoms are made up of three types of subatomic particles: protons, neutrons, and electrons. Protons and neutrons are found in the nucleus, the dense region at the center of an atom. Electrons are found outside the nucleus. Protons are positively charged and have a mass of about 1 u. Neutrons are neutral (have no charge) and also have a mass of ...
Electrons and protons have electrical charges that are identical in magnitude but opposite in sign. Relative charges of −1 and +1 are assigned to the electron and proton, respectively. Neutrons have approximately the same mass as protons but no charge. They are electrically neutral.
A helium atom is an atom of the chemical element helium. Helium is composed of two electrons bound by the electromagnetic force to a nucleus containing two protons along with two neutrons, depending on the isotope, held together by the strong force.
Its atomic number is 2, so it has two protons in its nucleus. Its nucleus also contains two neutrons. Since [Math Processing Error] 2 + 2 = 4, we know that the mass number of the helium atom is 4. Finally, the helium atom also contains two electrons, since the number of electrons must equal the number of protons.
