C1.6 - Structure Of The Atom Flashcards
1
Q
Subatomic particles
A
- protons
- electrons
- neutrons
2
Q
Proton
A
- positive charge +
- located in the nucleus
- relative mass of 1
3
Q
Neutron
A
- no charge
- located in the nucleus
- relative mass of 1
4
Q
Electron
A
- negative charge
- located in shells that orbit the nucleus
- relative mass of 0
- too small to contribute to the mass of the atom
5
Q
Atom neutral charge
A
- has equal number of protons and electrons
- so they cancel
- neutrons have no charge
6
Q
Atomic number
A
-refers to the number of protons
-all atoms of a particular element have the same number of protons
E.g hydrogen atoms all have the 1 proton
-this is also equal to the number of electrons
7
Q
Atomic mass number
A
- combination of proton number and neutron mass
- eg Be has 4 protons and 5 neutrons = mass number 9
8
Q
Number of neutrons formula
A
Mass number - atomic number
