What is it Isotopes are different versions of atoms having the same number of protons but different numbers of neutrons Atomic Mass The mass of each isotope is different due to the different number of neutrons ID: 546521
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Slide1
IsotopesSlide2
What is it?
Isotopes are different versions of atoms having the same number of protons but different numbers of neutrons.Slide3
Atomic Mass
The mass of each isotope is different due to the different number of neutrons.
Usually, one isotope of an element is more common than other isotopesSlide4
Example – Hydrogen Isotope
Three isotopes of Hydrogen
Protium
– most common (1 proton)
Deuterium – second most common(1 proton, 1 neutron)
Tritium – unstable and uncommon (1 proton, 2 neutrons)Slide5
Symbols
Isotope symbols are written by including the atomic mass and atomic number with the symbol
3
H
tritium
Or the name can be written out as
Hydrogen-3
3 is the atomic mass, 1 is the atomic number
1Slide6
Atomic mass on table
The atomic mass listed on the periodic table is the average atomic mass for all of the isotopes of the element as they are found in nature.
It is a weighted average, based on which isotopes are more common
The more common the isotope, the greater effect it has on the average.Slide7
Formula to find average
(# isotope1)(Mass isotope1) + (#isotope2)(massIsotope2) + (#isotope3)(mass Isotope3)
#isotope1 + #isotope2 + #isotope3