10 Questions
Which of the following statements about atoms is true?
Atoms are the smallest particle of a substance
What is a molecule?
A group of atoms joined together
Which of the following is an element?
Oxygen
How many natural elements are there on Earth?
94
What happens when two or more atoms join together?
They become molecules
What is the smallest particle of a substance?
Atom
Which of the following can exist independently?
Atom
What is formed when two or more atoms join together?
Compound
Which of the following is made up of only one kind of atom?
Element
How can chemical substances be divided into major subgroups?
By composition
Study Notes
Atomic Structure
- Atoms are the smallest particles of a substance and may or may not exist independently
- Molecules are formed when two or more atoms join together and can exist independently
Chemical Substances
- Chemical substances can be divided into two major subgroups: pure substances and mixtures
- Pure substances can be elements or compounds
Elements
- An element is a substance that is made up of only one kind of atom
- Elements cannot be broken down into simpler substances by chemical means
- Examples of elements: silver, gold, aluminium, hydrogen, oxygen
- Each element has its own distinct set of properties
- The atoms of an element will have all the properties of the particular element
- Fact file: There are over 118 known elements on earth, with 94 being natural
Test your knowledge on chemical substances, atoms, molecules, elements, compounds, and pure substances. Explore the concepts of atoms forming molecules, the distinction between elements and compounds, and the classification of chemical substances into pure substances and mixtures.
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