Study Guide (Periodic Table and His.) Flashcards

1
Q

Who attributed to the idea of arranging the known elements of his time in a table according to their chemical/physical properties?

A

Dmitri Mendeleev

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2
Q

_______ predicted that the empty spaces on his periodic table represented

A

undiscovered elements

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3
Q

Who arranged the periodic table in the order of Atomic #?

A

Henry Moseley

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4
Q

The periodic law states there is a periodic repetition of physical/chemical properties of the elements when…

A

they are arranged in order of increasing atomic #

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5
Q

name of vertical columns of the periodic table…

A

Groups

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6
Q

Each period in the periodic table corresponds to:

A

an energy level

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7
Q

Valence electrons:

A

electrons that are found in the outermost energy level of atoms

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8
Q

the horizontal rows of the periodic table are:

A

periods

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9
Q

what do elements in the same periodic group have in common

A

same # of valence configuration, valence electrons, and similar chemical properties

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10
Q

what do elements in the same period have in common

A

same # of occupied energy levels

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11
Q

how many elements are in a period in which only s and p sublevels are filled

A

8

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12
Q

sublevels in a period that contains 32 elements

A

s,p,d,f

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13
Q

(for groups 13-18) # of valence electrons is equal to:

A

its group # (or group # - 10)

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14
Q

Three classes of elements

A

metals, nonmetals, metalloids

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15
Q

(elements classes/ fams) Most reactive group of nonmetals

A

Halogens

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16
Q

(elements classes/ fams) group is unreactive + only found in pure form in nature

A

Noble gases

17
Q

(elements classes/ fams) groups name is “basic”

A

Alkaline Earth Metals

18
Q

(elements classes/ fams) group of metals contain groups 3-12

A

transition metals

19
Q

(elements classes/ fams) group contains most reactive group of metals

A

alkali metals

20
Q

(elements classes/ fams) elements are found in second row of f-block elements

A

actinides

21
Q

(elements classes/ fams) class of elements have both metallic/ nonmetallic properties

A

metalloids

22
Q

(periodic trends) why atomic radius decreases going across the period L to R on periodic table

A

bc valence electrons are being removed and are closer to positive nucleus (held tighter and harder to remove)

23
Q

(periodic trends) why atomic radius increases moving down a group of elements

A

of occupied energy level increases

24
Q

ionization energy

A

energy required to remove one electron from an atom

25
Q

As you move L to R across a period, the first ionization energies

A

Increases

26
Q

As you move from top to bottom of group, the first ionization energies

A

decreases

27
Q

What is general trend of electronegativity as you go down the group

A

electronegativity decreases down the group

28
Q

do metals tend to have high or low electronegativites

A

Low

29
Q

What is trend for reactivity for the alkali metals group

A

reactivity increases going down the group

30
Q

what is trend for reactivity for the halogens group?

A

reactivity decreases going down the group

31
Q

(elements classes/ fams) elements are found in first row of f-block elements

A

Lanthanides