C1 : Atomic number and Mass number Flashcards
1
Q
Why do Atoms have no overall charge
A
The protons cancel out the electrons
2
Q
What is the atomic number
A
The smaller number (the number at the bottom)
3
Q
What is the mass number
A
The bigger number (number at the top )
4
Q
What does the atomic number tell us
A
Amount of protons and electrons
5
Q
What does the mass number tell us
A
Amount of protons and neutrons
6
Q
How do we work out number of neutrons
A
Subtract atomic number from mass number
7
Q
What are isotopes
A
Atoms of an element with different numbers of neutrons
All numbers of an element have the same number of protons
8
Q
Ions
A
Ions are atoms with an overall charge, they have gained or lost electrons
Positive ions have lost electrons
Negative ions have gained electrons
