An isotope is identified by atomic number (element number or name), by mass number, and by atomic weight. The mass numberfor an isotope is listed as a leading superscript such as 29Si, which in this example is silicon containing 14 protons and 15 neutrons (a rarer but stable isotope of the element). Similarly the atomic weight is indicated by a superscript such as U235 , an isotope of uranium having 92 protons and 143 neutrons.
The actual atomic weight is often expressed as a decimal number corresponding to the mass of the atom in "atomic units", where a proton is about 1.0072, a neutron 1.0086, and an electron about .00055 atomic units.
Usually the top number in each element's box is the atomic number. This number represents a count of how many protons are in that atom's nucleus. It is always a whole number (because it's a count) and it never changes for that particular element. Hydrogen (H) has an atomic number of 1. Uranium (U) has an atomic number of 92.
The Atomic Mass of the isotope; for example, for the isotope uranium 235: 235U. The atomic number is bellow the atomic mass.
Any no on upper side of atomic symbol in Periodic Table represents its Atomic mass, which is average value of mass numbers of all the isotopes of that element.,
The Mass Number
Atomic Number
The top number is 14 and the bottom number is 6. The latter is the same for any isotope of carbon, but the top number changes with the number of neutrons in the isotope, because the top number is the mass number, which is defined to be the sum of the numbers of protons and neutrons.
an isotope of an element
The mass number of the isotope 228Ra is 228.
the protons will be the atomic number, in this case 26. The neutrons depends on which isotope. The most common isotope is iron-56, so that will have 30 neutrons. If the element is written in symbolic notation, the number on the top, minus the number on the bottom is the number of neutrons.
If you divide the number of atoms of a single isotope by the total number of atoms, you get the ratio of that isotope. This tells you how common/uncommon that isotope is.
The top number is 14 and the bottom number is 6. The latter is the same for any isotope of carbon, but the top number changes with the number of neutrons in the isotope, because the top number is the mass number, which is defined to be the sum of the numbers of protons and neutrons.
Subtract the atomic number of the isotope from its atomic mass number to obtain the number of neutrons in an isotope.
Atomic Mass (of an isotope) - number of protons (of an isotope) = number of neutrons (of an isotope)
The atomic number (not isotope number) of fermium is 100.
Mass number: 14 Atomic/proton number: 7 If you look at the periodic table, the mass number is the top and the atomic number is the bottom number.
an isotope of an element
For each isotope of Md the number of neutrons is different.Number of neutrons = Mass number of a Md isotope -101
The number next to any isotope represents the mass number
Each isotope of beryllium has a different number of neutrons.
The mass number of the isotope 228Ra is 228.
It is called an isotope.
An isotope is an element with the same number of electrons and protons different number of neutrons.