Atom Structure Flashcards
What is the size of an atom?
0.1 - 0.5 nm
1x10^-10 to 5x10^-10m
What is located in the nucleus?
Protons and neutrons.
Where are electrons located?
The outer shells
What is the mass of proton and neutron?
1 unit
What is the mass of an electron?
1/2000
What is the charge of a proton?
+1
What is the charge of a neutron?
0
What is the charge of an electron?
-1
Describe the mass number of an atom
It is the bigger number on the periodic table.
It is equal to the number of protons and neutrons in the atom.
Describe the atomic number of an atom.
It is the smaller number on the periodic table.
It is equal to the number of protons and electrons in an atom.
How do you find the number of neutrons in an atom?
Neutrons = Mass number - Atomic number.
What is an ion?
An ion is an atom that has lost or gained electrons.
