Atoms Flashcards
1
Q
What 3 subatomic particles is a atom made of?
A
- protons
- neutrons
- electrons
2
Q
What is the relative mass of an electron
A
0.0005
3
Q
What is the relative mass of a proton or neutron
A
1
4
Q
Describe the nucleus
A
- contains protons + neutrons
- positive charge due to protons
5
Q
Number of electrons = ?
A
Protons
6
Q
What does the atomic mass tell you
A
- how many protons
7
Q
What does the mass number tell you?
A
- total of protons and neutrons
8
Q
How does you get the number of neutrons
A
Mass number - atomic number
9
Q
What are molecules
A
A group of two or more atoms joined together by covalent bonds.
