Class 9 Practice Level 3 – Set 1 - Structure of the Atom

Total question: 15

Which isotope of uranium is commonly used as fuel in nuclear reactors?

Topic: Isotopes

$ \displaystyle {^{{233}}U}$

$ \displaystyle {^{{234}}U}$

$ \displaystyle {^{{235}}U}$

$ \displaystyle {^{{238}}U}$

None

The element with atomic number 29 has its last electron entering which subshell?

Topic: Electron Configuration

None

Which of the following elements has the highest first ionization energy?

Topic: Ionization Energy

Sodium

Magnesium

Aluminium

Silicon

None

Which element has the highest electron affinity?

Topic: Electron Affinity

Fluorine

Chlorine

Oxygen

Nitrogen

None

In Bohr's model of the atom, the energy of an electron in an orbit is:

Topic: Bohr’s Model

Quantized

Continuous

Variable

Infinite

None

The element with atomic number 15 has how many valence electrons?

Topic: Atomic Structure

None

The maximum number of electrons that can be accommodated in a subshell is given by:

Topic: Electron Configuration

2n²

4l + 2

2l + 1

None

Which of the following has the highest second ionization energy?

Topic: Ionization Energy

Sodium

Magnesium

Aluminium

Silicon

None

Which element has the highest electron affinity?

Topic: Electron Affinity

Fluorine

Chlorine

Oxygen

Nitrogen

None

10.

In Bohr's model of the atom, the energy of an electron in an orbit is:

Topic: Bohr’s Model

Quantized

Continuous

Variable

Infinite

None

11.

The element with atomic number 15 has how many valence electrons?

Topic: Atomic Structure

None

12.

An alpha particle contains:

Topic: Electron Configuration

2 positive charge and 4 mass unit

4 positive charge and 2 mass unit

2 positive charge and 2 mass unit

4 positive charge and 4 mass unit

None

13.

According to the Rutherford model, what is the main limitation of this atomic model?

Topic: Rutherford’s Experiment

It cannot explain the stability of the atom.

It cannot explain the line spectra of elements.

It cannot explain the existence of isotopes.

It cannot explain the presence of neutrons.

None

14.

Which of the following has the highest second ionization energy?

Topic: Ionization Energy

Sodium

Magnesium

Aluminium

Silicon

None

15.

The magnetic quantum number determines the:

Topic: Quantum Numbers

Shape of the orbital

Orientation of the orbital

Size of the orbital

Spin of the electron

None

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Class 9 Practice Level 3 – Set 1 - Structure of the Atom

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