protons will tell the atomic number (8)
the sum of protons and neutrons will give the mass number of the element
The weight of the atom
you can't tell the atomic mass of an atom if either the number of protons or neutrons is missing. But Boron with 5 protons and 6 neutrons has and atomic mass of 11.
Protons and neutrons together make up virtually all of the mass of an atom, so we count them to figure out the mass. Counting protons alone will tell us what element and isotope the atom is, but counting neutrons alone tells us nothing.
Atoms are defined by the number of protons in the nucleus; therefore, we can tell what element it is by the number of protons (the information about the neutrons and electrons is unnecessary). An atom with 77 protons is iridium.
The Atomic Mass tells you how many Protons and Neutrons are in the atom. It is approximately the sum of the number of protons and neutrons found in the nucleus of an atom. Basically the weight of the neutrons and protons in one atom
By the process of elimination. For example, The atomic weight of an atom is just the number of its protons, and the atomic mass is the total weight of protons and neutrons in the atom. So, the atomic weight of Oxygen is 8(protons) and the atomic mass is 16(protons + neutrons) so we can tell that there are 8 protons and 8 neutrons.
If the number of protons and neutrons are the same, its an atom, if not its an ion
If it has 23 protons it has to be Vanadium no matter the number of neutrons. Deciding what element an atom is depends solely on the number of protons. However, the neutrons tell you which isotope of vanadium it is.
they work because in every atom there is a neutron, electron and proton. the electron will tell you what the atomic number is and the neutrons and protons will tell you what element it is.
The weight of the atom
Oxygen. The Elements Atomic Number tells you the number of protons and it's amu is generally the weight of all of the averaged isotopes so since it is nearly 16 (not all O's have 8 neutrons) it is Oxygen.
nucleus of carbon atom contains 6 protons and 6 neutrons.
Atomic mass number of the atom. The best way to remember it is: the majority of the mass of an atom is made up of the protons and neutrons (the electrons are very light!), therefore the atomic mass number is the sum of the protons and neutrons.
you can't tell the atomic mass of an atom if either the number of protons or neutrons is missing. But Boron with 5 protons and 6 neutrons has and atomic mass of 11.
The mass number tells us the number (the sum) of protons and neutrons in the nucleus of an atom.
Protons and neutrons together make up virtually all of the mass of an atom, so we count them to figure out the mass. Counting protons alone will tell us what element and isotope the atom is, but counting neutrons alone tells us nothing.
The mass number of an atom is equal to the sum of its number of protons and neutrons, simply, nucleons.