Chemistry Atomic Structure Overview

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Questions and Answers

What particles make up nucleons?

Photons

Electrons

Quarks (correct)

Gluons

What charge does a neutron possess?

0.5

0 (correct)

-1

Where are protons and neutrons located in an atom?

Orbitals

Electron shells

Nucleus (correct)

Clouds around the nucleus

What is the charge of an electron?

-1 Signup and view all the answers

What components make up the atomic mass number?

Protons and neutrons Signup and view all the answers

How does the atomic number relate to the element?

It indicates the number of protons. Signup and view all the answers

Which of the following statements about nucleons is false?

Nucleons include protons and electrons. Signup and view all the answers

If the atomic number of an atom changes, what is the result?

The element changes. Signup and view all the answers

What does the term 'atom' mean?

Indivisible particle of matter Signup and view all the answers

Which subatomic particle is positively charged?

Proton Signup and view all the answers

What determines the chemical properties of an element?

The arrangement of electrons Signup and view all the answers

Which model of the atom proposed by Niels Bohr resembles a solar system?

Bohr Model Signup and view all the answers

In Dalton's atomic theory, how were elements classified?

By their atomic mass Signup and view all the answers

What is the atomic number (Z) of an element?

The number of protons in the nucleus Signup and view all the answers

What type of gases are found in Group VIII of the periodic table?

Noble gases Signup and view all the answers

How are electrons arranged around the nucleus of an atom?

In fixed orbits of different energy levels Signup and view all the answers

Which of the following statements is true about neutrons?

They have no charge Signup and view all the answers

What are the four classical elements proposed by ancient Greeks?

Earth, Air, Water, Fire Signup and view all the answers

What is not a fundamental particle of an atom?

Meson Signup and view all the answers

Which scientist first proposed the nuclear model of the atom?

Ernest Rutherford Signup and view all the answers

What primarily influences the stability of an atom?

Balance of protons and electrons Signup and view all the answers

Study Notes

The Meaning of Atom

"Atom" comes from the Greek words "a" (without) and "tom" (to cut), meaning "indivisible".
Atoms are the smallest particles of matter that have the properties of an element.

Atomic Structure

Atoms are composed of protons, neutrons, and electrons.
Protons and neutrons are located in the nucleus, which is the central part of the atom.
Electrons revolve around the nucleus in fixed orbits.

Chemical Properties

The chemical properties of an atom are determined by the number and arrangement of its electrons.

Elements

An element is a substance made up of only one type of atom.
There are 118 known elements, of which 92 are natural and 26 are artificial.

Atomic Number

The atomic number (Z#) represents the number of protons in an atom.
The atomic number determines the element.

Atomic Mass Number

The atomic mass number (A#) represents the total number of protons and neutrons in an atom.

Subatomic Particles

Proton:
- Located in the nucleus
- Positive charge (+1)
- Determines the element
- Determines the atomic number
Neutron:
- Located in the nucleus
- No charge (neutral)
- Contributes to the atomic mass number along with protons.
Electron:
- Located in electron shells/cloud surrounding the nucleus
- Negative charge (-1)
- Not included in atomic mass number or atomic number.

Nucleons

Nucleons include protons and neutrons.
They are composed of quarks.
Gluons hold quarks together.

Key Scientists

John Dalton (1808):
- Classified elements by atomic mass.
- Developed the atomic model, often referred to as the "hook and eye" model.
Dmitri Mendeleev (late 1800s):
- Arranged elements in order of increasing atomic mass.
- Developed the first periodic table with 8 groups.
J.J. Thomson (late 1890s):
- Discovered electrons as part of the atom.
- Proposed the "plum pudding model".
Ernest Rutherford (1911):
- Introduced the nuclear model.
- Proposed a small, dense, positively charged center (nucleus) surrounded by a negative cloud of electrons.
Niels Bohr (1913):
- Proposed the "solar system" model.
- Proposed electrons revolving around the nucleus in predetermined energy levels.

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Description

This quiz explores the concept of atoms, including their structure and properties. It covers key terms such as atomic number, atomic mass number, and the significance of subatomic particles. Test your knowledge on the fundamental building blocks of matter!