Atomic Structure and Notation Flashcards
1
Q
What is mass number?
A
of protons + # of neutrons
2
Q
What is atomic mass?
A
The average mass number of an element’s isotopes
3
Q
Top left?
A
Mass number
4
Q
Bottom left?
A
Atomic number
5
Q
Top right?
A
Charge
6
Q
What is an ion?
A
A charged atom
7
Q
What makes an atom unstable?
A
If there are more neutrons than protons
8
Q
What is an isotope?
A
Atoms of the same element with the same number of protons, but differing numbers of neutrons
9
Q
Where is most of the mass in an atom?
A
The nucleus
10
Q
Most of the volume of an atom is-
A
Empty space
