Isotopes and Relative Atomic Mass

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Presentation transcript:

Isotopes and Relative Atomic Mass What you need to know:

What do you remember? Can you draw and label the structure of an atom? EXT: Give three facts about the parts which make up an atom

What is an isotope? All atoms of an element have the same number of protons But some have different numbers of neutrons These are called ISOTOPES

Neutrons have no charge so this doesn’t affect the overall charge of a particle But they have a relative mass of 1, so this changes the mass number The mass number given in the periodic table is linked the relative abundance of each isotope

Example

7.6 x 6 = 45.6 92.4 x 7 = 646.8 = 692.4 Relative Atomic Mass = 692.4 ÷ 100 = 6.924 = 6.9 to 1 decimal place.

Now you can calculate R.A.M….. Complete the ‘Just Checking’ questions Textbook p35

Are these statements true or false Are these statements true or false? All atoms of the same element have the same number of protons. All atoms of the same element have the same number of neutrons. All atoms of the same element have the same mass number. All atoms of the same element have the same atomic number. True False False True