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What is the average atomic mass of an element with three isotopes that occur in equal amounts in nature the isotopes have masses of 200 amu 203 amu & 209 amu?
Answer Expert Verified Since all the isotopes occur in the same amount, to find the average atomic mass of the element, add the three mass values together and divide the result by 3. That is, Average atomic mass = [200 + 203 + 209] / 3 = 612 /3 = 204. Thus, the average atomic mass of the element is 204.
How do you calculate the atomic mass of an isotope?
For any given isotope, the sum of the numbers of protons and neutrons in the nucleus is called the mass number. This is because each proton and each neutron weigh one atomic mass unit (amu). By adding together the number of protons and neutrons and multiplying by 1 amu, you can calculate the mass of the atom.
How do you know how many isotopes an element has?
Subtract the atomic number (the number of protons) from the rounded atomic weight. This gives you the number of neutrons in the most common isotope. Use the interactive periodic table at The Berkeley Laboratory Isotopes Project to find what other isotopes of that element exist.
What is the atomic mass of arsenic?
74.9216 u
Arsenic/Atomic mass
What is the average atomic mass of bromine?
79.904 u
Bromine/Atomic mass
What is the formula of average atomic mass?
Calculating Average Atomic Mass The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope). Average atomic mass = f1M1 + f2M2 + …
How do you tell if it’s an isotope?
Look up at the atom on the periodic table of elements and find out what its atomic mass is. Subtract the number of protons from the atomic mass. This is the number of neutrons that the regular version of the atom has. If the number of neutrons in the given atom is different, than it is an isotope.