Atoms and Molecules week 16

Atoms and Molecules week 16 - Lets look at a few elements...

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Atom and Molecules Prepared By: Usama Farooq Week 16
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An atom is the smallest unit that maintains the characteristics of an element Nucleus- The center of the atom, contains protons and neutrons Electron Cloud –Region surrounding the nucleus containing the electrons ATOM
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The Nucleus Proton- A positively charged sub-atomic particle (+).The number of protons is the same as the atomic number Li 3 7 The atomic mass The atomic mass The Atomic Symbol Neutrons – A sub-atomic particle in the nucleus. Neutron do not have a charge (0)
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The Electron Cloud Electrons- The number of electrons equals the number of protons Sub-atomic particle with a negative charge (-) Mass of an electron is negligible Electrons behave as if in a 3-D orbit Valence Electrons The outer most electrons Valence electrons are responsible for bonding
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Bohr Model The first shell can have 2 electrons The second can have 8 electrons
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Shells and the Electron Cloud
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Let’s look at a few elements… Hydrogen 1= Proton 1= electron
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Unformatted text preview: Lets look at a few elements Lithium 3=protons 4=neutrons 3=electrons Lets look at a few elements Argon 18=protons 22=neutrons 18=electrons Isotopes Atoms of the same element with different number of neutrons Isotopes of Hydrogen Molecules Molecules A molecule is defined as a stable neutral group of at least two atoms in a definite arrangement held together by very strong chemical bonds . It can also be defined as a unit of two or more atoms held together by covalent bonds. Types Of bonding Ionic Bond : Ionic bonds are formed when atoms become ions by gaining or losing electrons. Covalent Bond: Covalent bonds form when atoms share electrons. Since electrons move very fast they can be shared, effectively filling or emptying the outer shells of the atoms involved in the bond. Such bonds are referred to as electron-sharing bonds. Guess What its Video Time The End Now Please Wake Up for Clapping....
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Atoms and Molecules week 16 - Lets look at a few elements...

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