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Periodicity Objectives:

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Presentation on theme: "Periodicity Objectives:"— Presentation transcript:

1 Periodicity Objectives:
AHSGE Reading Discern organizational patterns. Other AOD C.3.2 Recognize periodic trends of elements, including the number of valence electrons, atomic size, and reactivity. Periodicity


3 Periodic Law Dmitri Mendeleev’s periodic table had the elements arranged in order of increasing mass. There is a periodic repetition of chemical and physical properties of the elements when they are arranged by increasing atomic number

4 Modern Periodic Table What are the columns called? Answer: Groups
What are the horizontal rows called? Answer: Periods Label groups & rows on your periodic table!!

5 Modern Periodic Table Representative elements: elements in the A groups (1A-8A) “the main group” Possess a wide range of physical and chemical properties Transition elements: elements in the B groups (1B-8B)

6 Metals Describe some properties of metals. Metals:
Generally shiny Most are solid at room temperature Good conductors of heat and electricity Ductile and malleable Most group A and all group B elements are metals.

7 Groups 1A and 2A, EXCEPT HYROGEN, are metals.
The other elements in group 1A are called alkali metals. Reactive & Readily combine with group 6 and 7 elements. Group 2A elements are alkaline earth metals. Contain a pair of electrons in their outermost shell.

8 Both groups 1A and 2A are highly reactive (1A more so).
Why would group 1A be more reactive than group 2A? Answer: Group 2A has a FILLED s orbital, but group 1A’s s orbital is only half-filled, so that electron is still looking for a partner to hook up with.

9 Group B elements: Transition metals: located on the main body of the periodic table Inner transition metals: the 2 rows located along the bottom of the periodic table

10 Nonmetals Describe some properties of nonmetals. Nonmetals:
Generally gases or brittle, dull-looking solids Poor conductors of heat or electricity The ONLY nonmetal that is a liquid at room temperature is bromine. Located in the upper right portion of the periodic table

11 Halogens: Group 7A elements; highly reactive
Noble gases: Group 8A; extremely Unreactive. Why are group 8A elements unreactive? Answer: Their outer valence shell is filled, so they have no need to pair up with anyone else.

12 Metalloids Have properties of both metals and nonmetals.
Stair-step down from boron to astatine and germanium to polonium. They separate the metals and nonmetals on the periodic table.

13 Assignment Label the following on your blank periodic table:
Groups & periods Representative elements Transition elements Metals: alkali metals, alkaline earth metals, transition metals, and inner transition metals Nonmetals Halogens Noble gases metalloids

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