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Mini Quiz- Half SheetH = 1.01 g/mol, O = 16.00 g/mol
S = 32.07 g/mol, N = 14.01 g/mol, I = 126.90 g/mol
1. How many grams in 3.4 x 1023 molecules of H2SO4?
2. How many molecules are there in 0.40 g of N2I6?
Unstable Nuclei
Often nuclei of very large atoms are unstable…
Unstable Nuclei Stable Nuclei + Energy
Cause of InstabilityA p+ to no ratio that is not close to 1:1
Example: Polonium (Po) has 84 protons and 125 neutrons
Radioactive
Oxygen has 8 protons and 8 neutronsNot Radioactive
Nuclear Reaction
• Reaction that affects the nucleus of an atom.• Radioactive decay: Spontaneous disintegration
of a nucleus into a slight lighter nucleus.• Particles and energy can be emitted.• This is called nuclear radiation
92-Uranium-238
• 92 protons and 146 neutrons
• Radioactive nuclide• Undergoes a series of
radioactive decay