What is the difference between a rotation and revolution? JUST DO IT 3.12.13 Daily Riddle   In Question What is the difference between a rotation and revolution?

Today in your notebooks Left side items Right side items States of matter BP States of matter notes Solid, liquid, gas HW Bill Nye phases of matter Phase changes graph Molecular kinetic energy notes Atom diagram, brainpop Atoms notes Element box calculations Element box notes P, N, E practice HW Periodic table PT groups/famillies, PT brainpop PT notes Atomic trends Atomic trends notes

Atomic trends 3.12.13 Atomic radius- size of the atom. Decr. -across the row. Even though more electrons are added to the outside shell, it doesn’t become bigger. Protons are bigger and stronger than electrons, and the strength of the protons pulls them in. Incr. -down a group (column), each period adds an electron shell 2) Electron Affinity- the ability to attract electrons. Incr. - across a row. The strong protons in the nucleus attract the electrons. Groups 16/17 only have 1-2 electron spots to fill so it’s easy for them to grab the electrons. Decr.- down a column. The nucleus is farther away and less likely to attract an electron. 3) Ionization energy- the energy needed to take an electron from the atom. Incr. as you move across the row. Easiest to take an electron from elements in groups 1,2 and 12. Decr. – as you move down a column

Bonding (Right) What is a chemical bond? What is a molecule? What is a compound? 4) What are the three types of bonds? How are they different? 5) What is a polar molecule? CHEMICAL BOND: An attraction between atoms, forms a chemical substance MOLECULE: Atoms of a single element or different element joined together COMPOUND: one or more molecules joined together 4) IONIC: a transfer of electrons. Breaks down into ions. COVALENT: a sharing of electrons. Breaks down into molecules HYDROGEN: the bond between a hydrogen atom and an electronegative atom (O,N, F) 5) POLAR MOLECULE: a molecule with a positive and negative side

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