E. Science 9 - Quarter 2 Reviewer Lesson 1 Quiz

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Questions and Answers

According to the Plum Pudding Model, what was the expected behavior of particles passing through the uniformly positively charged sphere?

They were expected to be repelled by the nucleus.

They were expected to pass through with little or no deflection. (correct)

They were expected to get completely absorbed by the sphere.

They were expected to bounce back at an angle.

Who is credited with discovering the electron through the Cathode Ray Tube Experiment?

Ernest Rutherford

Joseph John Thomson (correct)

John Dalton

Niels Bohr

What did Ernest Rutherford's Gold Foil Experiment reveal about the structure of an atom?

An atom is electrically neutral because there are equal amounts of positive and negatively charged electrons.

Electrons orbit the nucleus in specific energy orbits.

Atoms are made up of indivisible particles called atoms.

Atoms are mostly empty and most of its mass is concentrated in its positively charged center. (correct)

What is the main characteristic of Niels Bohr's Planetary Model regarding the energy of electrons in different orbits?

Smaller orbits have smaller energy. Signup and view all the answers

What causes an electron to produce radiation as it returns to its ground state in Niels Bohr's model?

As it moves away from the nucleus, it loses electrostatic attraction. Signup and view all the answers

Which model proposed that an atom is electrically neutral due to an equal balance of positive and negatively charged electrons?

Plum Pudding Model Signup and view all the answers

What did Erwin Schroedinger's Quantum Mechanical Model propose about the movement of electrons?

Electrons move around the nucleus in a wave-like pattern. Signup and view all the answers

According to the Electron Cloud Model, what does an orbital represent?

A region with a high probability of containing electrons. Signup and view all the answers

What is Werner Heisenberg's Uncertainty Principle related to electrons?

It's impossible to know the exact position and momentum of an electron at the same time. Signup and view all the answers

What is the Aufbau Principle about electron configuration?

Electrons tend to fill lower orbitals first before moving up. Signup and view all the answers

What is the Principal Quantum Number (n) used to determine?

The energy level of an electron. Signup and view all the answers

What does the Magnetic Quantum Number (m sub l) determine?

The possible orientations in space of a particular orbital. Signup and view all the answers

'Fully paired' and 'unpaired' electrons are associated with which quantum number?

Spin Quantum Number Signup and view all the answers

Study Notes

Models of the Atom

According to the Plum Pudding Model, particles passing through a uniformly positively charged sphere were expected to behave in a certain way.

Discovery of the Electron

J.J. Thomson is credited with discovering the electron through the Cathode Ray Tube Experiment.

Rutherford's Gold Foil Experiment

Rutherford's Gold Foil Experiment revealed that atoms have a small, dense, positively charged nucleus at their center.

Bohr's Planetary Model

In Niels Bohr's Planetary Model, electrons occupy specific energy levels (or orbits) around the nucleus, and the main characteristic is that electrons in different orbits have different energy levels.
When an electron returns to its ground state, it produces radiation, which is caused by the release of excess energy.

Electrically Neutral Atom

The Plum Pudding Model proposes that an atom is electrically neutral due to an equal balance of positive and negatively charged electrons.

Quantum Mechanical Model

Erwin Schroedinger's Quantum Mechanical Model proposes that electrons move in a probabilistic manner, and their position and momentum cannot be precisely known at the same time.

Electron Cloud Model

In the Electron Cloud Model, an orbital represents the probability distribution of finding an electron within a specific region around the nucleus.

Uncertainty Principle

Werner Heisenberg's Uncertainty Principle states that it is impossible to know an electron's precise position and momentum simultaneously.

Aufbau Principle

The Aufbau Principle is about electron configuration, stating that electrons occupy the lowest available energy levels in an atom.

Quantum Numbers

The Principal Quantum Number (n) is used to determine the energy level of an electron.
The Magnetic Quantum Number (m sub l) determines the orientation of an orbital around the nucleus.
The concept of 'fully paired' and 'unpaired' electrons is associated with the Spin Quantum Number (m sub s).

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Description

Test your knowledge on the electronic structure of an atom with this quiz. Questions cover key historical experiments and models such as John Dalton's Billiard Ball Model and Ernest Rutherford's Nuclear Model.