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I. What is an atom?

I. What is an atom?. Atoms are the basic unit of matter All matter is made up of tiny atoms. Atom. Atoms are the building blocks of all matter. Molecule. Atom. Subatomic. O. water. H. H. Subatomic Particles (Draw this). Structure of an atom.

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I. What is an atom?

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  1. I. What is an atom? • Atoms are the basic unit of matter • All matter is made up of tiny atoms

  2. Atom Atoms are the building blocks of all matter Molecule Atom Subatomic O water H H

  3. Subatomic Particles (Draw this)

  4. Structure of an atom • There are 3 subatomic particles in an atom • Proton • Neutron • Electron

  5. p+ THE PROTON • Found in the nucleus • Heavy: 1 amu • Positive: +1

  6. N° THE NEUTRON • Located in the nucleus. • Heavy: 1 amu • Neutral: 0 charge

  7. Outer Edge of Atom ½ Football Field End Zone Nucleus: Dense/Heavy but tiny part of atomFound in center of an atom Nucleus 50

  8. Atomic Nucleus Summary • The nucleus is a dense area at the center of the atom • Protonsand neutronsare found in the atomic nucleus

  9. e- THE ELECTRON • Found in the electron cloud • Very light: 0 amu • Negative: -1 charge

  10. Electrons • Electrons have a relatively small masscompared to protons and neutrons • Electrons are found far away from the nucleus in an area called the electron cloud • Electrons have a negative charge

  11. How small is an atom? • Atoms are TINY! • 20 million hydrogen atoms would fit inside the period at the end of this sentence. • You are made of billions and billions of atoms • http://htwins.net/scale2/

  12. Neutrons Electrons p+  e- N° Protons Positive +1 Neutral 0 Negative -1

  13. Nucleusis held together with nuclear energy http://www.youtube.com/watch?v=pV822HfqT44 Electron cloudis full of zipping electrons

  14. Please complete the following table Electron Cloud Nucleus Nucleus Heavy 1amu Heavy 1amu Very Light 1amu Neutral  0 Negative  -1 Positive  +1

  15. ATOMS HAVE A NEUTRAL CHARGE (most of the time……) • When we talk about the atoms of elements on the periodic table, we usually assume they have the same number of electrons as they do protons, giving the atom a neutral charge (+1 and -1 = 0 charge) • So if the atomic number of an atom is 8, how many electrons do we have? • Neutrally charged Atoms will have the same number of electrons as protons

  16. How can I tell which atom is which element? • Every atom of an element has an ATOMIC SYMBOL- the letters representing the element Au, Ca etc. ATOMIC NUMBER – the number of protons + in an atom. Each element has a unique atomic number Example Carbon’s atomic number is 6, but Boron has an atomic number of 5 ATOMIC MASS – the number of protons + plus neutrons 0 in an atom. Example Carbon’s atomic number is 6, but its atomic mass is 12 6 protons and 6 neutrons

  17. P+ e- P+ P+ e- N0 What is the atomic number of this atom? 3 e-

  18. Review of Atomic Structure • What is the basic unit of matter? • Atom • What are the 3 subatomic particles? • Proton, Neutron, Electron • What’s the electrical charge of a proton? • Positive (+) • What’s the electrical charge of a neutron? • Neutral • What’s the electrical charge of an electron? • Negative (-)

  19. REMEMBER WHAT A PROPER ATOM LOOKS LIKE e- e- P+ P+ P+ N0 e-

  20. - - + + - + Name something wrong with this atom 0 0

  21. + + What is wrong with this atom? 0 - - - 0 0 +

  22. - + + 0 0 + 0 0 What is wrong with this Atom? -

  23. Draw an atom CORRECTLY • 2 protons, 1 neutron, 2 electrons

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