Question # 1

The no.of elements in the first period is

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2

8

18

23

The modern periodic table is based on:

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Atomic number

Mass number

Relative mass

Nil

________________ is the shortest period.

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6th

8th

2nd

1st

Group runs from ________________

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Top to bottom

Left to right

Top to right

Bottom to left

Modern periodic table can be classified into ________________.

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Elements

s, p, d, f blocks

Periods

ROWS

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

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English

Italian

African

Indian

The periodic table consist of ________________ columns.

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Periods

Rows

Column

Nil

The vertical columns in the periodic table are called:

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perlods

groups

rows

blocks

The no. of periods in modern periodic table are

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7

11

18

23

4^th and 5^th period of the long form of periodic table are called

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short periods

Normal periods

Long periods

Very long periods

Long form of periodic Table is constructed the basis of:

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Mendeleev postulate

atomic number

atomic mass

mass number

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

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Chemistry 9th Class English Medium Unit 3 Online Test MCQs With Answers

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