Isotopes.

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Presentation transcript:

Isotopes

What is an isotope? Not every atom is exactly the same We know that different elements have different number of protons. However even atoms of the same element are not exactly the same. Atoms of the same element can have different number of neutrons. These are called Isotopes.

It’s all about the Mass Number Because Isotopes differ in their number of neutrons, the mass of the atom also changes. Isotopes are identified by their mass numbers. Remember, mass number is the sum of what two particles? Protons and Neutrons!

1 Proton 1 Proton 1 Proton 0 Neutrons 1 Neutron 2 Neutrons Mass # = 1 Mass # = 2 Mass # = 3

Isotopic Notation Isotopic Notation is generally how isotopes are written. Mass number on top Atomic number on bottom This format makes it easy to calculate number of Neutrons How do we calculate neutrons?

Isotopes have different mass numbers and also different numbers of neutrons. Mass Number – Atomic Number = Neutrons

Identify the number of Protons, Neutrons, and Electrons for each of the following: A) Carbon-12 B) Carbon-14 C) 104Be D) Phosphorus-32