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Periodic Table & Atomic Numbers Quiz

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Questions and Answers

Which scientist discovered the concept of atomic number?

Henry Moseley (correct)

Albert Einstein

Marie Curie

Niels Bohr

What is the purpose of the Periodic Table?

To organize elements by decreasing atomic number

To organize elements by increasing atomic number (correct)

To organize elements by decreasing atomic mass

To organize elements by increasing atomic mass

What does the atomic number of an element represent?

The number of neutrons in the nucleus

The number of electrons in the nucleus

The number of protons in the nucleus (correct)

The number of protons and neutrons in the nucleus

What is the term used to describe the repeating pattern in the Periodic Table?

Periodicity Signup and view all the answers

What are isotopes?

Atoms of the same element with different numbers of neutrons Signup and view all the answers

What is the smallest particle of an element that retains the properties of the element called?

atom Signup and view all the answers

What instrument allows individual atoms to be seen?

scanning tunneling microscope (STM) Signup and view all the answers

What is a cathode ray?

a stream of particles carrying a negative charge Signup and view all the answers

What are the particles carrying a negative charge known as?

electrons Signup and view all the answers

Who measured the effects of both magnetic and electric fields on the cathode ray to determine the charge-to-mass ratio of a charged particle?

J.J. Thomson Signup and view all the answers

Study Notes

Atomic Structure and the Periodic Table

The concept of atomic number was discovered by Henry Moseley.
The purpose of the Periodic Table is to organize elements in a logical and systematic order.

Atomic Number and Elements

The atomic number of an element represents the number of protons present in the nucleus of an atom.
The smallest particle of an element that retains the properties of the element is called an atom.

Periodic Trends and Patterns

The repeating pattern in the Periodic Table is described as periodicity.

Isotopes and Atomic Structure

Isotopes are atoms of the same element that have the same atomic number but differ in atomic mass due to varying numbers of neutrons.

Atomic Visualization and Charged Particles

The instrument that allows individual atoms to be seen is the Scanning Tunneling Microscope (STM).
A cathode ray is a stream of electrons emitted from a cathode (negatively charged electrode) in a vacuum tube.
The particles carrying a negative charge are electrons.
J.J. Thomson measured the effects of both magnetic and electric fields on the cathode ray to determine the charge-to-mass ratio of an electron.

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Description

Test your knowledge of the periodic table and atomic numbers with this quiz. Explore the organization of the periodic table and understand how atomic numbers determine the placement of elements.