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?

Nuclear Chemistry

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

3 Main types of radioactive decay

• Alpha• Beta• Gamma

Alpha Particle

• Nucleus of a Helium atom• 2 p+ and 2 no

• Mass = 4, Atomic number = 2

Beta Particle

• neutron to proton ratio that is too high

• Mass = 0, number -1

Gamma Radiation

• High energy electromagnetic waves (light)• No mass• Pure energy

g

Radiation Exposure

Balancing Nuclear Equations

212-4 = 208 mass of new element84-2 = 82 atomic number of new element

Balancing Nuclear Equations

Uses for Nuclear Radiation

Uses for Nuclear Radiation

Uses for Nuclear Radiation

Nuclear Fission• Heavy nuclei splits into more stable nuclei• Releases enormous amount of energy

Nuclear Reactors

Nuclear Fusion2 small nuclei form a larger nuclei, producing a crazy amount of energy.

Warm Up

What is the difference between nuclear fission and fusion?

Nuclear Reactors

Nuclear Fusion2 small nuclei form a larger nuclei, producing a crazy amount of energy.

Questions on Vegium?

Check your calculations… do you have the right number of SF?

Check your Isotope WS

Do you have any questions on these calculations?

Work I’m Collecting

VegiumUnit 2 ReviewAtomic Structure WS- (3 worksheets on 1 sheet)Isotope WS