1.16, 1.17 Isotopes
Isotopes
Isotopes - atoms of the same element with the same atomic number but different masses
E.g. Isotopes of carbon
Isotopes do not differ chemically (same no. of electrons). However physical properties may vary due to different mass numbers. (different no. of neutrons)
Working out Ar from Isotopes abundances
Ar = relative atomic mass
Ar is a weighted average, it is worked out using the abundance of each isotope.
e.g. Chlorine has 2 isotopes (Cl 35 and Cl 37)
75% = Cl35
25% = Cl37
Calculation
(35 x 75%) + (37 x 25%) = 35.5
Isotopes - atoms of the same element with the same atomic number but different masses
E.g. Isotopes of carbon
Isotopes do not differ chemically (same no. of electrons). However physical properties may vary due to different mass numbers. (different no. of neutrons)
Working out Ar from Isotopes abundances
Ar = relative atomic mass
Ar is a weighted average, it is worked out using the abundance of each isotope.
e.g. Chlorine has 2 isotopes (Cl 35 and Cl 37)
75% = Cl35
25% = Cl37
Calculation
(35 x 75%) + (37 x 25%) = 35.5
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