You need to know the charge on the atom or ion. The mass number is completely irrelevant if you have the atomic number.
The atomic number tells you the number of protons in the nucleus.
If the atom is neutral, then it has as many protons as electrons, and so the number of electrons equals the atomic number
If the atom is charged, and is thus called an ion, than take the atomic number and subtract the charge from it to give the number of electrons.
For instance, if you have a sodium ion with charge +1 (Na+), then the number of protons is equal to 11 (the atomic number), and the number of electrons is
11 - 1 = 10
If instead you had a chlorine ion with charge -1 (Cl-), then the number of protons is equal to 17 (the atomic number), and the number of electrons is
17 - -1 = 18
See the Related Questions to the left for more information about how to count the particles of an atom.
The # of protons in an atom is always the same as the atomic # of that atom, and to figure out the # of neutrons in an atom, take the atomic # away from the mass number.
Be careful, mass number and Atomic Mass are not the same thing. Mass number is number of protons and neutrons in an isotope. Atomic mass is the weighted average mass of the naturally occurring isotopes. Atomic mass can be fractional eg 35.45 but atomic number must be a whole number eg 37
You must also be given or find in a reference the mass number of the isotope in question. Then the number of electrons can be subtracted from the mass number to give the number of neutrons in the atom.
Atomic number = No. of protons and No. of electrons in a neutral atom (Meaning it has not taken place in any reaction,i.e., it is not an ion).
Atomic Mass - Atomic number (Or, No. Of Protons)= No. Of Neutrons.
The protons and neutrons are located in the center of the atom. The proton count is equal to its atomic number. The difference between the mass number and atomic number of an atom is equivalent to its number of neutrons.
Atomic mass is the number of protons plus the number of neutrons.
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Unless it's an ion, atoms have the same number of electrons as protons
The proton has a relative charge of +1
The neutron is neutral -- no charge.
Subtract the atomic number from the mass number
Protons and Neutrons.
Cl-35 isotope has 18 neutrons Cl-37 isotope has 20 neutrons
There are 6 neutrons in carbon. it depends on which isotope of carbon it is. C-12 has 6 neutrons C-13 has 7 neutrons C-14 has 8 neutrons
106 neutrons
Subtract the atomic number from the mass number
The isotope of zirconim, 91Zr, has 51 neutrons. In order to solve this problem, one must know that an element's atomic weight is the average of its number of protons and neutrons (only neutrons are variable). Since the atomic number is the number of protons, the atomic number subtracted from the atomic weight gives the number of neutrons. An element in period 5 that has this many neutrons is found to be zirconium (the isotope 91Zr).
This is an easy problem to solve if you have a Periodic Table of Elements.# protons + # neutrons = atomic number3 + 4 = 7The element with the atomic number 7 is Nitrogen.
neutrons
protons, neutrons, electrons.protons, neutrons, electrons.protons, neutrons, electrons.protons, neutrons, electrons.
How many neutrons would it have if it had 11 neutrons? 11.
Neutrons are completely separate from protons, so neutrons do not have any protons, and protons do not have any neutrons.
61 neutrons 47 protons and 47 neutrons
30 neutrons for Na35Cl and 32 neutrons for Na37Cl .
Protons and Neutrons.
Number of neutrons = mass number - atomic number = 40 - 20 = 20 neutrons
if you were to count the individual weight of all the protons neutrons and electrons you will get 40. however this is not the case when they are joined together due to something call the strong neuclear force which causes the atom to weigh 39.9