Chemistry Flashcards
0
Q
What is atomic number?
A
Number of protons in the nucleus
1
Q
What is atomic mass?
A
Protons+neutrons in the nucleus
2
Q
What are molecules?
A
The smallest stable unit. It has two or more atoms joined together
3
Q
Who discovered the electron
A
J.J Thompson discovered the electron and it’s negative charge in 1897
4
Q
What is an element
A
A single atom. E.g hydrogen
5
Q
What is a mixture?
A
An impure substance made up of elements and compounds in no fixed amount
6
Q
What is a compound?
A
Made up of two or more elements joined in fixed amounts
