Question # 1

The atomic number of potassium is:

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11

15

18

19

An ________________ scientist arranged the elements in order in periodic table.

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English

Italian

African

Indian

.................... of an atom is not fixed.

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Size

Mass

Electronegativity

Nuclear char

Transition elements are:

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all gases

all metals

all non-metals

all metalloids

________________ elements were discovered in year 1800.

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34

35

36

37

The elements of group 17 are called:

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Carbon family

Noble gases

Alkaline earth metals

Halogen family

The vertical columns in the periodic table are called:

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perlods

groups

rows

blocks

Th name of chemist who arranged all the elements in the periodic tale is :

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J.Newlands

Columb

Einstine

None of these

............... periodic table consist of group & periods.

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Bohr

Rutherford

Mendeleev's

Nil

The no. of electrons in the valence shell of alkali metals is

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1

2

4

7

Along the period which one of the following decrease:

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Atomic radius

ionization energy

electron affinity

electronegative

The periodic table consist of ________________ columns.

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Periods

Rows

Column

Nil

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