You may have noticed on the periodic table that the atomic mass of an element is usually not a whole number. That happens because of isotopes. An atom that is missing a neutron or has an extra neutron is called an isotope. They are still the same element; however, they are just a little different from every other atom of the same element.
Most of the carbon atoms in the universe are Carbon-12, with 6 neutrons. A small percentage of carbon atoms are Carbon-13, with 7 neutrons, and an even smaller percentage are Carbon-14 and have 8 neutrons. Carbon-13 and Carbon-14 are isotopes of carbon. Atomic mass is calculated by determining how many atoms of each isotope type are present in the universe. Since the isotopes of carbon make up only a small percentage of the carbon in the universe, the average of the masses of all carbon atoms is slightly higher than 12, so the atomic mass for carbon is actually 12.011.
Analyze the isotopes of “Metallo” and to calculate its atomic mass
sample of metallo (bag of mixed nuts, bolts, and washers)
1. Obtain a sample of the new element “Metallo.”
2. Separate the three isotopes of Metallo (nuts, washers, bolts) and measure the mass of each isotope. 3. Count the numbers of each isotope.
4. Record all data in the table.