ISOTOPES.

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Presentation transcript:

ISOTOPES

What does this Symbol Mean? Symbol for lithium. Second letter is always lower case. What does this Symbol Mean? 7 L Therefore A Lithium atom contains 3 protons 4 neutrons (3+4=7) i Mass Number protons + neutrons 3 Atomic Number Number of protons

But something is different! Both these symbols represent carbon atoms. But something is different! 14 12 12 Different mass number

12 p e 6 n 6 p e 6 n 6 6 8

Isotopes are atoms with the same number of protons but a different number of neutrons. Most elements have several different isotopes but only one or two of which are stable.

Past Questions B B e e 9 11 4 4 What is the an isotope? Atoms of an element that contain the same number of protons but a different number of neutrons. 2. Calculate the number of protons and neutrons in these two atoms of beryllium. 9 B 11 B e e 4 4 p 4 e n 7 p 4 e n 5