Glad you asked. Pull up a chair and we'll tackle this one. We need to do a little review before we confront the isotope issue. Ready? Then let's have at it. An atom is an atom, but it becomes a particular element when we know the number of protons in its nucleus. Each element has a unique number of protons in its nucleus, and that is what determines what element it is. Hydrogen has one, helium has two, etc. But the kicker is that, though each element has a specific number of protons, it can have different number of neutrons in the nucleus of one of its atoms and still be that element. Same element (same number of protons), but different numbers of neutrons. Different atomic configurations of a given element are called isotopes of that element. Take helium for example. It has two protons (which is what makes it helium), but it can appear with one or with two neutrons. Each of these is an isotope of helium, and each one is stable, meaning it will not spontaneously undergo any atomic transformation. One other thing is that there are about a million atoms of He-4 for every atom of He-3. There are other isotopes of helium with three, four and more neutrons, but these are artifically made and are unstable. They will decay in a fairly short time. Now we've covered isotopes. The mass number (or Atomic Mass number or nucleon number) is simply the number of protons plus the number of neutrons in an atom. That's all. If we talk about, say, an atom of U-235, which is a fissionable isotope of uranium, the 235 is the atomic mass number. The element uranium has the atomic number 92, which means that there are 92 protons in its nucleus. If we subtract that 92 from the 235, we get 143 as a result, and that will be the number of neutrons in the nucleus of that isotope of 92U. Simple and easy. One more example. Carbon has an atomic number of 6, and carbon-14 has 14 minus 6 = 8 neutrons in it. Now you've got the scoop on isotopes, mass numbers and neutron counts.
There is no clear relation between the number of protons and neutrons in an atom. Most elements exist with a variation in the number of neutrons in their nuclei, altough some are more stable than others. The atomic mass is aprox. the number of protons + the number of neutrons
The atomic number = the number of protons. The mass of a given isotope is roughly proportional to the total protons and neutrons in the nucleus. (Less binding energy, of course.)
Very direct. The neutrons and protons make up the majority of an atoms mass. Electrons add very little weight even in large atoms.
The mass number is the sum of protons and neutrons in the atomic nucleus.
Because the number of neutrons in isotopes is variable the mass number is also different.
Protons, neutrons and electrons are located in the atom. The protons and neutrons are located in the atomic nucleus; the electrons are around the nucleus, arranged in shells.
157; you figure that out by taking the atomic mass (259) and subtract it by the # of protons (102) and the answer is the # of neutrons. ( the atomic #, # of protons, and # of electrons are always the same # 102 ). But each isotope of nobelium has a different number of neutrons, depending on the atomic mass.
The atomic mass number is the sum of the protons and neutrons of an element. The protons are given by the atomic number, so the neutrons can be found by subtracting the mass number by the atomic number. Both the mass and atomic numbers can be found on the periodic table.
Neutrons have the same mass as a proton but lack an electrical charge. The number of neutrons can be found by subtracting the atomic number, or number of protons in the atom, from the atomic weight. This is calculated this way because the atomic weight represents both the number of protons and neutrons. Fluorine's atomic number is 9 and its atomic weight is 18.998, so 18.998-9= 9.998. Consequently, 9.998 is fluorine's number of neutrons.
Uranium 235 has 92 protons and 92 electrons. To find the number of neutrons, follow this equation: Mass # - Atomic # = # of neutrons. Since the mass number of uranium 235 is 235 and has an atomic number of 92, the number of neutrons is 143.
Atomic number = number of protons + number of neutrons Mass number = number of protons + number of neutrons
The atomic number is equivalent to the number of protons; the number of neutrons is different for each isotope.
The atomic number corresponds to the number of protons in the nucleus of an atom. It also corresponds to the number of electrons in a neutral atom. A neutral atom, you'll recall, is one where the number of electrons equals the number of protons in the nucleus of an atom. We remember that atoms often "loan out" or "borrow" electrons, so the electron count will not always equal the proton count.
atomic mass of an atom = number of neutrons + number of protons For example the Deuterium isotope of Hydrogen Atomic mass number = 2 Atomic number = 1 The atomic number is the same as number of protons, so the Deuterium isotope has 1 proton atomic mass of an atom = number of neutrons + number of protons 2 = n + 1 n = 1
Protons and neutrons are normally found in the atomic nucleus.
Not the atomic mass but the mass number (of course, these values are similar - not identical).The mass number is the sum between the number of protons and the number of neutrons. As a consequence:Number of neutrons for an isotope = Mass number - Number of protonsThe number of protons is equal to the atomic number.
The atomic number correlates to the number of protons found in the nucleus of an atom. The atomic number also dictates the number of electrons that orbit the nucleus if the atom in neutral. Finally the atomic mass is the number of protons and neutrons found in the nucleus. The atomic number equals the number of protons (p+) or electron (e-).
The atomic number of lithium is 3. Therefor there are 3 protons and neutron in the nucleus of lithium. Lithium also has 4 neutrons. atomic # = protons and neutrons neutrons = rounded atomic mass - atomic number Sources- 7th grade Acc. Science
Atomic Mass: protons AND neutrons atomic number: just protons
The number of protons is the atomic number.
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