Welcome to….ChemJEOPARDY on Periodic trends….

Periodic Trends in the properties of atoms allow US to predict physical _____ and chemical properties___. Bonus: What scientist is given the most credit because he published his info first? Mendeleev

With periodic trends…Meyer and Mendeleev both demonstrated a connection between _atomic mass____ and _elements properties________.

The Modern Periodic Table The modern periodic table contains boxes that contain the element's _atomic #_____, _elements__, __symbol_____ , and atomic _mass___.

In the periodic table, Groups are the….. Rows of elements Elements in groups 1,2, and 13–18 Columns of elements Elements in groups 3–12 Elements are classified as metals, nonmetals, and metalloids.

Why do elements in the same group have similar properties? Because…they have the same valence electrons

Atomic size is a periodic trend influenced by electron configuration Atomic size is a periodic trend influenced by electron configuration. For metals, atomic radius is……. The answer is ½ the distance between adjacent nuclei of 2 identical elements

Trends among elements in the periodic table include their ________ and their abilities to_________ or _______ electrons B is the answer Shapes/lose/gain Size/lose/gain Shapes/gain/misplace Size/Lose/misplace

Atomic radius usually ________as you move across the Periodic Table, and _______ as you move down the Periodic table. Answer is b increases/increases decreases/increases decreases/decreases increases/decreases Bonus: why? Bonus: WHY?

Ions …..(fill in each) i. An ion is an atom or bonded group of atoms with a _+______ or _____-___charge. Atoms become charged by either __gaining__or losing __ electrons. Cations: atoms __lose _electrons and become __+_____ charged Anions: atoms _gain__ electrons and become __-_____ charged

True/False Anions – ARE actually Bigger than the neutral atom, because the addition of an electron increases electrostatic repulsion ___True____.

Ionic Radius :True/False The ionic radii positive ions (cations) generally decrease from left to right.__true_______ The ionic radii of negative ions (anions) generally decrease from left to right, beginning with group 15 or 16.__true_____ Both positive and negative ions increase in size moving down a group.____true______

Atomic & Ionic Radii- Mixed Practice B C If the figure represents the atoms helium, krypton, and radon, match the letter to the correct atom. If the figure represents a cation, an anion, and a neutral atom from the same period, match the letter to correct term. A = Radon B =Kryp. C=hel A –anion B -atom C cation

Arrange the following elements in order of decreasing Ionization Energy. Al, Mg, Na, Si ___ to ___to ___to ____(lowest)

Which below is the ENERGY needed to remove an electron from an atom of an element in a gaseous state? Ionic radius Law of octets Ionization energy Electronegativity Saturation

Ionization Energy Decreases from left to right across a period Ionization energy is defined as the energy required to remove an electron from a gaseous atom. So, the First Ionization Energy is the energy required to remove the first electron so it: Decreases from left to right across a period Increase from left to right across a period Decreases from top to bottom in a group Increases from top to bottom in a group A & C B& C A & D B& D B & D Bonus: WHY is it the answer above?

Octet Rule = true Octet rule - states that atoms tend to gain, lose or share electrons in order to acquire a full set of eight valence electrons. The octet rule is useful for predicting what types of ions an element is likely to form.

What is Electronegativity? ….

Electronegativity - Practice Arrange the following in increasing order of electronegativity( 1 point each) Na, Li, K Ca, Br, Se

Final Jeopardy!!!!!! What is the trend for ionization energy? How does this relate to atomic radius?