★ Must-know
Further detail
The diagram labels:
An oxygen molecule contains two bonded oxygen atoms.
★ Must-know
Further detail
Different elements have distinct chemical and physical properties because they consist of their respective kinds of atoms; silver consists of silver atoms and gold of gold atoms.
Table salt consists of sodium and chlorine; sugar consists of carbon, hydrogen, and oxygen; chalk consists of calcium, carbon, and oxygen.
An element contains one kind of atom; a compound combines different elements.
Elements and Compounds
1. Regarding the smallest particles of substances, which statements are correct?
2. A particle consists of several atoms joined together by chemical bonds. Which statements describe molecules correctly?
3. Molecules belonging to one particular substance share which characteristics?
What is an atom?
The chemically indivisible smallest particle of a substance.
What are the components of a molecule?
Atoms joined by chemical bonds.
What remains the same in molecules of a given substance?
The kinds and numbers of atoms.
What defines an element?
A substance consisting of only one kind of atom.
How many naturally occurring elements have scientists identified?
92.
What defines a chemical compound?
A substance made from atoms of different elements.
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