7.1 Flashcards
1
Q
How many types of atoms (elements) are there?
A
118.
98 of which are natural and 20 of which are lab made.
2
Q
Who proposed the atomic theory?
A
John Dalton, an english scientist
3
Q
What can multiple atoms form?
A
Molecules & Lattices.
4
Q
What is an element?
A
A substance made up of 1 type of atom.
e.g. Oxygen Molecule/O₂
5
Q
What is a compound?
A
A substance made up of different types of atoms.
e.g. Salt/NaCl
