Question # 1

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

Why has isotopes not been shown int he periodic table.

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Isotopes do not show periodic behavior

Periodic tble cannot accomodate a large number of isotopes of different elements

All the isotops have same atomic number so there is no need to give them separate places

Someof the isotopes are unstble and they give rise to different elements.

Quantum means.

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Virable energy

Fixed energy

High energy

Minimum energy

How many electons can be accommodated in S subshell?

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2

6

14

10

How is radio carbon dating useful for archeolgists.

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It helps detemine whether the matter is radioactie or not

It helps determine the age of organic matter

It helps determine the composition of matter

It helps deterime the usefulness of matter

The percentage of ²³⁸ U ₉₂ found in nature.

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97%

0.72%

98%

1.5%

Whcih subshells are present in L - shell?

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S and P

Only s -sub shell

Only p - sub shell

Sub shell

Carbon -14 is used for the

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Growth of bones

Diagonosis of goiter

Age determination of old objects

All of these

Proton are feflected toward plate.

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Positive

Negative

Both a and b

None of these

In which isotope of oxygen there are the equal numbr of protons electons and neutorns.

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O¹⁶

¹⁷O

¹⁸O

None of these

Atomic number is represented by

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P

A

At

Z

A sub sheel that cna accommodate 6 electrons is

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b

s

f

p

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