Sca.2.4.5 CHEMISTRY and Periodic Table
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Sca.2.4.5 CHEMISTRY and Periodic Table

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  • Sodium is number 11 in the periodic table so it hasProtons and 12 neutrons = mass number 23 (rounded atomic masss)Sodium also has 11 electronsWhen drawing a picture of an atom energy levels are filled in the following manner:1st (inner level) 2 electrons max2nd8 electrons max3rd18 electrons max4th18 electrons max5th32 electrons max
  • Teacher Notes:Remind students to refer to their periodic table.Metals will always form positive ions, while nonmetals will form negative ones. The reason for this is that they are gaining or losing electrons that have a negative charge.To find the number of valence electrons always refer the students to their periodic table. The number on top of each group that includes the letter A. means the number of valence electrons. So Nitrogen is under group 5A meaning 5 valence electrons.All metals want to lose ALL of their valence electrons.All nonmetals want to end with 8 valence electrons, except Hydrogen, that only wants to end with two.Click on each clip to show the movie clips of the formation of each ion.

Sca.2.4.5 CHEMISTRY and Periodic Table Sca.2.4.5 CHEMISTRY and Periodic Table Presentation Transcript

  • SC.A.2.4.5 – Groups, periods and electrons
  • Sodium and Potassium in Water
    2
    • View sodium and potassium in water youtube video:
    • Click here
    Compare the reactions of sodium and potassium in water.
    Why do you think that they reacted similarly?
    2
  • The Basics:
    Atomic Number = # protons (+)
    11
    Na
    22.998
    Symbol
    Energy Level filling
    2
    8
    18
    32
    Atomic Mass = Mass # (rounded)= protons + neutrons
    P+
    N
  • Lightning Questions
    How many protons and electrons are found in an atom of Chlorine?
    How many neutrons are found in an atom of Sodium (Na) that has a mass number of 23 amu?
    What happens to an atom when you add another proton?
    How can you change the mass number of an atom of sodium?
    4
    4
  • 5
    Groups and Periods
    Groups or families are vertical columns in the periodic table
    Periods are horizontal rows in the periodic table.
    The zig- zag line separates metals from non-metals
    Group or family
    Period
    With the discovery of isotopes by Mosley in 1909, the Periodic Table was reorganized by increasing atomic number (number of protons).
    This is modern Periodic Table we use today!
    5
  • Valence Electrons
    These are the electrons found in the last level of an atom.
    They are the MOST important electrons in determining the reactivity of an atom.
    Elements with the same number of valence electrons will react similarly.
    As a rule elements in the same group have the same number of valence electrons.
    For example: Hydrogen, Lithium, Sodium etc all have 1 valence electron.
    GROUPS 1A – 8A GIVE THE # OF VALENCE ELECTRONS
    6
    6
  • 7
    Valence Electrons
    Lithium is #3 in the periodic table. So it has THREE electrons.
    As we had stated before two electrons are in first level, leaving ONE electron in level 2.
    So Lithium has ONE valence electron.
    7
  • Lightning Questions!!!
    How many electrons are there in an atom of Sulfur (S)?
    How many valence electrons are found in an atom of Sulfur?
    Name an element that would have similar chemical properties to Sulfur.
    8
    Click here for: Graphing Lab #2
    Click here: Post Lab Clip
    8
  • Reactivity and the groups
    Some elements are more reactive than others. Why?
    Valence electrons!
    All atoms want a full octet (8 valence electrons). Think about elements like fluorine or chlorine. They’re so close to having 8 valence electrons. Are they reactive?
    What about elements in group 1? Reactive or not?
    Group 2 elements?
    Group 4?
  • Ca +2 Cations and Anions N-3
    • Metals lose their valence electrons to form cations
    • Cations = positive. (Cat’s whiskers)
    Click here for: Cation clip
    • Nonmetals will gain enough electrons to form anions. They will take as many electrons they need to get 8 valence electrons.
    • Anions = negative (An means to negate)
    Click here for:Anion clip
    10
    10
  • FCAT Multiple Choice Sample Questions
    Mr. Lopez’s science class is playing an educational game to study the periodictable. He gives Trahn a card with some clues to help him identify a particular group on the periodic table. Below is Trahn’s card.
    12
    Which chemical group……
    1. Reacts with water to form basic solutions
    2. Readily combines in nature to form other compounds
    3. Loses 2 outer energy level electrons to form +2 ions
    Trahn’s card describes which group on the periodic table?
    F. Group 1
    G. Group 2
    H. Group 16
    I. Group 18
    FCAT Science Sample Test Book 2007
    12
  • FCAT Multiple Choice Sample Questions
    Julio is given an unknown element to study. After carefully analyzing his element he arrives at the following conclusions.
    His element has a very low density and when it reacts with other elements it gains 3 electrons to form an anion with a -3 charge.
    In which of the following groups could we find Julio’s element?
    A) Group 3
    B) Group 5
    C) Group 13
    D) Group 15
    13
  • FCAT Multiple Choice Sample Questions
    3. Suppose a scientist makes an unexpected discovery about the possible existence of a new element. The finding does not fit well with the initial hypothesis. The scientist is a member of a team of researchers. If the team behaves according to the best principles of scientific inquiry, which of the following would NOT occur?
    A) rejection of the finding as being impossible.
    B) willingness to repeat the studies that led to the finding for
    confirmation.
    C) urging the scientist to communicate findings to other
    researchers.
    D) insistence on reviewing all data carefully and systematically for any errors.
    14