Chemistry.

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Presentation transcript:

Chemistry

Periodic Table of Elements

Atoms Very very small Placed side by side, 100 million atoms would make a row only about 1 cm long (about the width of your pinkie)

Subatomic Particles Protons + Neutrons Electrons – Atomic mass = protons + neutrons

Isotopes Atoms of the same element with a different mass They have more neutrons Radioactive Isotopes (unstable nucleus that breaks down over time) Carbon 14 Carbon 12 Half life

Compounds 2 or more elements combined ie water  What is water made of? When elements are combined they can be very different from how they are when they are solo

Chemical Bonds This is what holds the atoms/elements in compounds 2 main kinds

Ionic Bonds This bond happens when 1 or more electrons are transferred (given) from one atom to another

Covalent Bonds This bond happens when electrons are shared by atoms

Molecule The structure when atoms are joined by covalent bonds Smallest unit of most compounds

Van der Waals Forces When molecules are close together – a slight attraction can develop between regions of opposite charges on nearby molecules http://www.youtube.com/watch?v=DOaoxzacLdE&feature=related Climbing leopard gecko

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