Electron configuration Flashcards
What does a nucleus contain?
Protons and neutrons
What is the atomic number of an atom?
The number of protons it contains
What do elements in a group have the same number of?
Electrons in the outer shell
What do elements in a period have the same number of?
Shells
What is the charge of a neutron?
0
What is the charge of a proton?
+1
What is the charge of an electron?
-1
What is the relative mass of a proton/neutron?
1
In an atom, what is always equal?
The number of electrons and protons
What is the mass number of an atom?
The sum of the amount of protons and neutrons
What is the noble gas configuration? What does this mean?
They all have full outer shells. They can’t react and are very stable because they have no reason to share electrons.
What is the maximum capacity in the first three shells of an electron?
2, 8, 8
