P2 Radiation from Rocks Revision pt1 Mock 2015

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Presentation transcript:

P2 Radiation from Rocks Revision pt1 Mock 2015

Particle Relative Mass Relative Charge PROTON – positive, same mass as neutron (“1”) NEUTRON – neutral, same mass as proton (“1”) ELECTRON – negative, mass nearly nothing Particle Relative Mass Relative Charge Proton 1 Neutron Electron 1/1850 -1

number of protons is the same as the number electrons 2 4 MASS NUMBER = number of protons + number of neutrons SYMBOL ATOMIC NUMBER = number of protons (proton number) For a neutral atom the number of protons is the same as the number electrons

U Example 238 U is the symbol for uranium 92 p = 92 therefore there are 92 protons m = 238 so there is 238 nucleons (m – p) 238 – 92 = 146 neutrons

Isotopes:- The three isotopes of oxygen An isotope is an atom with the same number of protons but a different number of neutrons: O 8 16 17 18 Each isotope has 8 protons – if it didn’t then it just wouldn’t be oxygen any more. Notice that the mass number is different. How many neutrons does each isotope have?