PT history and placement
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What did Mendeleev recognize? | When the elements were arranged in order of increasing atomic mass certain similarities in their chemical properties appeared at regular intervals
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| Who made the first periodic table? | Mendeleev
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| What led Mendeleev to leave blank spaces on his periodic table? | he predicted the existence and properties of the elements that he believed would fill the spaces.
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| What was wrong with Mendeleev's table? | Most of the elements could be arranged in order of increasing atomic mass but a few could not.
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| What did Moseley discover about atomic structure? | that the atomic number is the basis for the organization on the periodic table
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| How did Moseley arrange his periodic table? | by increasing number of protons in the neclues
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| What is periodic law? | The physical and chemical properties of the elements are periodic functions of their atomic numbers
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| Is the periodic law based upon Mendeleev's or Moseley's PT? | Moseley
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| Is the modern PT from Moseley or Mendeleev? | Moseley
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| Representative elements include group numbers | 1-8
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| Transition elements include | the middle section
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| Inner Transition elements include | the bottom two rows
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| What are the three main catagories of elements? | metals,nonmetals, and metalloids
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| The ability of a substance to be hammered into sheets | malleable
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| The ability of a substance to be drawn out into wire | ductile
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| material which permits the flow of energy | conductor
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| Break or shatter easily | brittle
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| Why do elements in the same group have similar chemical properties? | they have the same number of electrons
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| Where are the s block elements located? | groups 1-2 (the left side)
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| Where are the p block elements located? | groups 13-18 (the right side)
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| Where are the d block elements located? | groups 3-12 (the middle section)
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| Where are the f block elements located? | bottom 2
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| What arrangement of electrons is particularly stable? | having a full outer energy lever (also called an octet)
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| How many naturally occurring elements? | 92, 93+ are man-made
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| Metals are ... | left of zigzag on PT
shiny
solid at room tempurature
conduct heat/electricity
malleable
ductile
react with some acids to form hydrogen gas
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| All metals are solid except | mercury
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| Nonmetals are ... | right of zigzag
generally gasses or brittle at room temp
poor conductors
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| Nonmetals are generally gasses or brittle at room temp except | bromine
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| Metalloids are ... | along the zigzag
properties of both metals and nonmetals
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| Group I of the PT is also known as the | alkali metals/ sodium family
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| Group I of the PT properties are | extremely chemically reactive
one valance electron
e- conf. always ends in s^1
developed charge +1 in chem. rx.
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| Group II of the PT is also known as | alkaline earth metals/ calcium family
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| Properties of Group II on the PT are | chemically reactive
two valance electrons
e- conf. always ends in +2
develop a charge of +2 in chem. rx.
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| Group III on the PT also known as | boron family
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| Properties of Group III on the PT are | moderately chemically reactive
three valance electrons
e- conf. always ends in s^2 p^1
develop a charge of +3 in chem. rx.
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| Group IV on the PT is also known as | carbon family
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| Properties of Group IV are | somewhat chemically reactive
4 valence electrons
e- conf. ends in s^2 p^2
develop charge of + or - 4 in a chemical reaction
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Created by:
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