4.1.2 - Mass Number, Atomic Number, & Isotopes Flashcards
1
Q
What is the Atomic Number of an element?
A
The number of protons and electrons in an atom of that element.
2
Q
What is the Mass Number of an element?
A
The number of protons and neutrons in an atom of that element’s nucleus.
3
Q
True or False? All Atoms of a certain element will have the same number of protons.
A
True - If the number of protons was different it would be a different element.
4
Q
What are Isotopes?
A
Atoms with the same number of protons, but a different number of neutrons.
5
Q
How many Stable Isotopes do elements usually have?
A
One or Two.
6
Q
What do Unstable Isotopes do?
A
Decay into other elements by giving out radiation or neutrons from their nucleus.
