Question # 1

Mass Number is repreented by

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Z

S

A

M

Who performed fist experiment to split atom

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Bohr

Newton

Rutherford

Soddy

What information was obtained fom discharge tube expriments?

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Electrons and protons were discovered

Structur eof atom was discovered

Neutrons and protons were discovered

Presence of nucleus in an atom was discovered

Quantum means.

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Virable energy

Fixed energy

High energy

Minimum energy

Which of the following statement is not correct about isotopes.

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they have same atomic number

They have same number of protons

They have same physical properties

They have same chemical propeties

N-shell contains number of subshells.

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1

3

4

2

The percentage of ²³⁸ U ₉₂ found in nature.

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97%

0.72%

98%

1.5%

An element has 5 electrons in M shell. Its tomic number is.

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5

10

15

20

Number of isotopes of hydrogen is

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2

5

4

3

Number of electrons that an be accomodated in f - subshell

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6

10

2

14

Which Isotopes is commonly used to irradiate cancer cells.

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Cobalt -60

Iodine-23

Carbon -14

Iodine-131

John Dalton put forward his atomic theory.

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1800

1803

1805

1903

Number of neurtons in ²⁷M₁₃are

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13

14

27

15

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