Chemistry GCSE Revision

Isotopes

What are isotopes?

Isotopes are the same element because they have the same proton number. Their atomic mass is different because they have different numbers of neutrons

Atomic mass = number of protons + number of neutrons

Calculating the relative atomic mass.

Both isotopes of chlorine are:

75% is chlorine 35 and 25% is chlorine 37

Step 1. The masses and abundances of the isotopes are 75% of Cl with a mass Of 35 and 25% Cl with a mass of 37

Step 2. In 100 atoms, 75 will have a mass of 35 and 25 will have a mass of 37

Step 3. Mass of 100 atoms (75 x 35) + (25 x 37) = 3550

Step 4. Mean mass = 3550/100 = 35.5

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