1.1 Simple Model of the Atom Flashcards
1
Q
What is an atom?
A
The smallest part of an element that can exist and is what all substances are made of.
2
Q
How are atoms of each element represented? Give some examples (use oxygen and sodium).
A
By a chemical symbol; for example: O represents an atom of oxygen, Na represents an atom of sodium.
3
Q
What is an element?
A
A substance made up of only one type of atom.
4
Q
Where are elements shown?
A
Elements are shown in the periodic table
5
Q
How many elements are there?
A
About 100 different elements.
6
Q
How are compounds formed?
A
(From elements) by chemical reactions.
7
Q
A
Chemical reactions always involve the formation of one or more new substances, and often involve a detectable energy change.
