Class 9 Practice Level 3 – Set 2 – Structure of the Atom

Total question: 15

Which of the following electron configurations represents an excited state of an atom?

Topic: Electron Configuration

$ \displaystyle 1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}$

$ \displaystyle 1{{s}^{2}}2{{s}^{2}}2{{p}^{5}}3{{s}^{1}}$

$ \displaystyle 1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{1}}$

$ \displaystyle 1{{s}^{2}}2{{s}^{2}}2{{p}^{5}}$

None

Which of the following elements has the smallest atomic radius?

Topic: Atomic Radius

None

Which element experiences the greatest effective nuclear charge on its valence electrons?

Topic: Effective Nuclear Charge

None

Which element has the electron configuration $ \displaystyle \left[ {Ar} \right]\text{ }4{{s}^{2}}3{{d}^{{10}}}4{{p}^{3}}$ ?

Topic: Electron Configuration

Phosphorus

Arsenic

Antimony

Bismuth

None

Which scientist proposed the uncertainty principle?

Topic: Atomic Structure

Niels Bohr

Erwin Schrödinger

Werner Heisenberg

Louis de Broglie

None

Which of the following statements is true about effective nuclear charge?

Topic: Effective Nuclear Charge

It increases down a group.

It decreases across a period.

It increases across a period.

It remains constant across a period.

None

What is the maximum number of electrons that can occupy a single orbital?

Topic: Quantum Numbers

None

In the quantum mechanical model of the atom, electrons are described as:

Topic: Quantum machine

Particles

Waves

Both particles and waves

Neither particles nor waves

None

Which element has the electron configuration $ \displaystyle 1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{1}}$ ?

Topic: Electron Configuration

Boron

Aluminium

Gallium

Indium

None

10.

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

Topic: Ionization Energy

Magnesium

Aluminium

Silicon

Phosphorus

None

11.

Which of the following elements has the least exothermic electron affinity?

Topic: Electron Affinity

Fluorine

Oxygen

Nitrogen

Carbon

None

12.

Which of the following elements has the largest atomic radius?

Topic: Atomic Radius

Sodium

Magnesium

Aluminium

Silicon

None

13.

Which element experiences the least effective nuclear charge on its valence electrons?

Topic: Effective Nuclear Charge

None

14.

What is the electron configuration of the $ \displaystyle M{{n}^{2+}}$ ion (atomic number 25)?

Topic: Electron Configuration

$ \displaystyle {\left[ {Ar} \right]\text{ }3{{d}^{5}}}$

$ \displaystyle {\left[ {Ar} \right]\text{ }4{{s}^{2}}3{{d}^{3}}}$

$ \displaystyle {\left[ {Ar} \right]\text{ }4{{s}^{1}}3{{d}^{4}}}$

$ \displaystyle {\left[ {Ar} \right]\text{ }4{{s}^{2}}3{{d}^{6}}}$

None

15.

Which of the following has the highest fourth ionization energy?

Topic: Ionization Energy

Aluminium

Silicon

Phosphorus

Sulphur

None

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Class 9 Practice Level 3 – Set 2 – Structure of the Atom

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