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Look on a periodic table. If you have different isotopes then you need to multiply the mass number and atomic number and then find the average of them and you'll have the average atomic mass which is the same as on the periodic table. The location of the mass number on a periodic table depends but it's normally the one with a decimal.
Look at the Periodic Table.
look on the periodic table of the elements
Mass number is the number underneath the elements letter on the Periodic Table.
The atomic number is the whole # on the periodic table or the # of protons in an atom. The atomic mass is the # that is not the whole # on the periodic table, or you can multiply the mass of the isotope by its abundance and add the answers together.
The mass number is the number of protons plus the number of neutrons in the atomic nucleus.
The number of protons in an atom is its atomic number, which you can find on the periodic table. To calculate the number of neutrons, subtract the atomic number from the atomic mass listed on the periodic table.
in the garden
a modern periodic table should have the 118 elements, their atomic numbers, and their masses. to find the number of protons and electrons, they are the same as the atomic number. to find the neutrons, subtract the protons from the mass.
The mass number of an element is the total number of protons and neutrons in its nucleus. To find the mass number on the periodic table, locate the element and round the atomic mass to the nearest whole number, which is the total number of protons and neutrons.
You use a Periodic Table to find the group, period, and the material of the 115 elements. You can find the the number of protons/electrons on the bottom of the symbols(which is arranged in oder). You can the mass number on the VERY bottom of the element's block. You can find out the number of neutrons by subtracting the number of protons/electrons from the mass number.
Mendeleev's version of the Periodic Table was organized by increasing mass. The modern periodic table is now organized by atomic number.