Bellringer 10/01/12 How many protons, neutrons and electrons are in U-235 and Pu-244?

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Presentation transcript:

Bellringer 10/01/12 How many protons, neutrons and electrons are in U-235 and Pu-244?

IsotopeSymbolComposition of the nucleus Isotope Mass in (amu) Relative Abundance (% in nature) Copper protons 34 neutrons % Copper protons 36 neutrons % Calculating Average Mass Atomic mass is the average of all the naturally isotopes of that element. Copper = amu Cu xMass (amu)Relative abundance (% as a decimal) x62.93 amu0.692= amu Copper-63 Copper-65 x64.93 amu0.308= amu amu Periodic Table of Elements

IsotopeSym bol Atomic # neutronselectronsMass Number (p + + n 0 ) Isotope Mass in (amu) Relative abundance Carbon-12 6C6C = = % Carbon-13 6C6C 613 – 6 = = % Your Turn (Calculate Average Mass) C Carbon Atomic # Atomic mass (average) xMass (amu)Relative abundance (% as a decimal) x amu0.9889= amu Carbon-12 Carbon-13 x amu0.0111= amu amu12.01 amu

IsotopeSym bol Atomic # neutronselectronsMass Number (p + + n 0 ) Isotope Mass in (amu) Relative abundance Nitrogen-14 N % Nitrogen-15 N % Chlorine-35 Cl % Chlorine-37 Cl % = = = = xMass (amu)Relative abundance (% as a decimal) x amu0.9963= amu Nitrogen-14 Nitrogen-15 x amu amu amu = amu N Nitrogen Your Turn (Calculate Average Mass)

IsotopeSym bol Atomic # neutronselectronsMass Number (p + + n 0 ) Isotope Mass in (amu) Relative abundance Nitrogen-14 N % Nitrogen-15 N % Chlorine-35 Cl % Chlorine-37 Cl % = = = = xMass (amu)Relative abundance (% as a decimal) x amu0.7577= amu Chlorine-35 Chlorine-37 x amu amu amu = amu Cl Chlorine Your Turn (Calculate Average Mass)

Mass # = p + + n 0 Calculate Average Mass xMass (amu)Relative abundance (% as a decimal) x = Lead-204 Lead-206 x = Pb Lead p 122n 82p 124n 82p 125n 82p 126n 1.37% 26.26%20.82%51.55% Mass # No amu mass shown. Use mass # instead. % abundance: Lead-207 x = Lead-208 x =

IsotopeSym bol Atomic # neutronselectronsMass Number (p + + n 0 ) Isotope Mass in (amu) Relative abundance Helium-3 2 He % Helium-4 2 He % Your Turn (Calculate Average Mass) 3 4 He Helium Atomic # Atomic mass (average) xMass (amu)Relative abundance (% as a decimal) x amu = amu Helium-3 Helium-4 x amu = amu amu amu