Helium, The hydrogen atoms fuse to form helium, atomic number 2 and mass number 4. In the illustration, the gray spheres represent neutrons and the orange are protons. The number of protons in the nucleus of any atom determines the identity of that atom. In this case two protons indicate element #2 or helium. This fusion reaction, which occurs in the sun and other stars, also produces an additional neutron and energy.
Helium
An atom is larger than a neutron; a neutron is a part of any atom except a hydrogen atom.
A white dwarf is much larger than a neutron star.
The largest element in a Period (row) will be on the right of that Period (i.e. an inert gas). The largest element in a Group (column) will be at the bottom of that group. Examples; Helium is larger than Hydrogen (Period 1) Krypton is larger than Potassium (Period 3) Francium is larger than Lithium (Group 1) Ununquadium is larger than Carbon (Group 3)
Neutron therapy can treat larger tumors than conventional radiation therapy
Helium
An atom is larger than a neutron; a neutron is a part of any atom except a hydrogen atom.
Isotopes are atoms of the same element that have differing numbers of neutrons. An example would be Cl-35 and Cl-37. Cl-37 has a larger amount of neutrons than Cl-35 has.
A single proton (not part of a larger nucleus) is the same as a positive hydrogen ion.
Fusionable isotopes refer to the larger isotopes that are usually relatively stable.
A white dwarf is much larger than a neutron star.
Yes it is.
Yes, a nebula is far larger than a neutron star. A neutron star is a few miles across. A nebula is light years across.
Yes, it is true for all chemical elements. But attention: isotopes of an element have different nuclear properties.
The largest element in a Period (row) will be on the right of that Period (i.e. an inert gas). The largest element in a Group (column) will be at the bottom of that group. Examples; Helium is larger than Hydrogen (Period 1) Krypton is larger than Potassium (Period 3) Francium is larger than Lithium (Group 1) Ununquadium is larger than Carbon (Group 3)
an atom is larger than an element
an isotope that is radioactive