U1-2-3 - Atomic Structure Flashcards
1
Q
A proton has a mass of ….. and a charge of …. .
A
mass = 1
charge = +1
2
Q
A neutron has a mass of …. and a charge of …. .
A
mass = 1
charge = 0
3
Q
An electron has a mass of …. and a charge of …. .
A
mass = 0
charge = –1
4
Q
Protons and neutrons are located in the …
A
nucleus.
5
Q
Electrons are located in …
A
electron shells.
6
Q
Atomic number
A
The number of protons. Defines an element.
7
Q
Mass number
A
The number of protons and neutrons
8
Q
How do you calculate the number of neutrons in an atom?
A
No. of neutrons = Mass number – Atomic number
9
Q
Why are atoms neutral?
A
Equal number of protons and electrons.
+ and – charges cancel out.
