Chemistry: Structure of the Atom

Questions and Answers

What is atomic theory?

The scientific study of atoms

A type of chemical bond

The smallest particle of matter (correct)

The building blocks of life

Where are protons located?

Inside the nucleus

What is the charge of a proton?

Positively charged

What is the symbol for a proton?

p+ Signup and view all the answers

Where are neutrons located?

In the nucleus Signup and view all the answers

What is the charge of a neutron?

No charge (neutral) Signup and view all the answers

What is the symbol for a neutron?

n Signup and view all the answers

Where are electrons located?

Orbits outside the nucleus Signup and view all the answers

What is the charge of an electron?

Negatively charged Signup and view all the answers

What is the mass of an electron compared to protons and neutrons?

Virtually weightless Signup and view all the answers

What is the atomic number?

The number of protons Signup and view all the answers

What does the mass number represent?

The number of protons plus the neutrons Signup and view all the answers

What units is mass measured in?

Atomic mass units (amu) Signup and view all the answers

The number of protons in an atom must equal the _____

number of electrons Signup and view all the answers

Study Notes

Atomic Theory

Atoms are the smallest units of matter and are fundamental building blocks of all substances.

Protons

Protons are located in the nucleus of the atom.
They carry a positive charge, denoted as p+.
Each proton has a mass of approximately 1 atomic mass unit (amu).

Neutrons

Neutrons are also found in the nucleus.
They possess no electric charge, making them neutral, denoted as n.
The mass of a neutron is around 1 amu, similar to protons.

Electrons

Electrons orbit the nucleus and are much smaller than protons and neutrons.
They are considered virtually weightless and carry a negative charge, represented as e-.

Atomic Number

The atomic number identifies an element and is defined as the total number of protons in the nucleus.
Each element has a unique atomic number that distinguishes it from other elements.

Mass Number (Atomic Mass)

The mass number is the sum of protons and neutrons in an atom.
It is measured in atomic mass units (amu), providing a way to gauge the total mass of an atom.

Description

Test your knowledge of atomic structure with these flashcards designed for Grade 9 Chemistry. Explore key terms like atomic theory, protons, neutrons, and electrons to enhance your understanding of matter. Perfect for quick revision before exams!