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Unit 3: Introduction to Chemistry What is chemistry? The Atomic Theory states... 1. All matter is made up of atoms. 2. All atoms of a given element are identical. 3. Compounds are formed when atoms of different elements combine in fixed amounts. 4. An atom cannot be created or destroyed, just rearranged in a chemical reaction. Fill this chart in as we go through the notes. Atoms are known as the building block of matter. They are made of 3 subatomic particles... Subatomic Particle proton neutron electron Charge Location in Atom Atomic Mass in AMU (atomic mass unit) Function 1,000,000 Carbon atoms make up width of 1 strand of human hair. 1 trillion atoms 500 years to make one human cell Amt. of time it would take you to count the atoms in a grain of salt. DID YOU KNOW??? Atomic Mass: 1 AMU Function: identify element Atomic Mass: 1 AMU Function: give mass Atomic Mass: < 1 AMU (less than 1 AMU) Function: chemical properties Check your chart. Atoms are known as the building block of matter. They are made of 3 subatomic particles... Subatomic Particle Charge Location in Atom Atomic Mass in AMU (atomic mass unit) Function proton positive (+) inside the nucleus 1 amu identify element neutron no charge inside the nucleus 1 amu give it mass electron negative (-) outside of the nucleus in electron orbits/levels less than 1 amu chemical properties Periodic TableArrangement of all chemical elements. Each element represents one atom of the given element. The table is arranged in order by increasing atomic number. Atomic Number= # of protons= # of electrons Remember: APE Mass Number= # of protons + # of neutrons Remember: MAN 4 Steps to Determining the Number of Protons, Electrons, and Neutrons 1. Look up the givens on the periodic table: atomic number & mass number (Hint: this is the decimal--round the number to a whole number) 2. Fill in the number of protons and electrons (Hint: same as the atomic #) 3. Mass #- atomic #= # of neutrons 1. Check your math. A=P=E & the protons & neutrons should=mass #