Recent Lessons

Show all results for ""

Feature Overview

Ace your exams with our all-in-one platform for creating and sharing quizzes and tests.

Quizzes

Create quizzes and tests automatically from your content using AI.

Flashcards

Automatically turn your notes into digital flashcards.

Share, Export & Embed

Share with classmates or export to Excel and your learning management system.

Stats & Reporting

Auto-grading quizzes and tests with detailed stats and reports.

Mobile Apps

The smarter way to study – wherever you are.

Pricing

Search...

13 Questions

0 Views

8 Atomic Theory SAQ1

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the definition of an atomic number?

The number of protons in the nucleus of an atom.

How is the mass number of an atom calculated?

By summing the number of protons and neutrons in the nucleus.

What is the difference between isotopes of the same element?

They have the same number of protons but different numbers of neutrons.

What is the Law of Conservation of Mass, as stated by John Dalton?

Atoms cannot be created or destroyed in the course of a chemical reaction. Signup and view all the answers

What was the significance of J.J. Thomson's cathode ray experiment?

It showed that sub-atomic particles existed and that cathode rays are negatively charged. Signup and view all the answers

What was the purpose of Ernest Rutherford's α-particle scattering experiment?

To study the structure of the atomic nucleus. Signup and view all the answers

Who is credited with suggesting the name 'electron' for negatively charged particles?

Johnstone Stoney. Signup and view all the answers

What was the significance of Robert Milikan's oil drop experiment?

It determined the charge on an electron. Signup and view all the answers

What is the main feature of Niels Bohr's model of the atom?

The Bohr model describes the energy levels of electrons in an atom. Signup and view all the answers

What is the significance of John Dalton's law of conservation of mass in the context of atomic theory?

It states that atoms cannot be created or destroyed in a chemical reaction, and it is a fundamental principle that explains the conservation of mass during chemical reactions. Signup and view all the answers

What are the five processes involved in the operation of a mass spectrometer?

Vaporisation, Ionisation, Acceleration, Seperation, Detection Signup and view all the answers

What is the principle that the mass spectrometer operates on?

The mass spectrometer works on the principle that ions can be separated according to their mass. Signup and view all the answers

What is Jammes Chadwick credited with discovering?

Discovering the existence of neutrons Signup and view all the answers