Size and Mass of Atoms

Cards (9)

State the radius of an atom.
0.1nm or 1 x $10^{-10}$ m
State the radius of an nucleus.
1 x 10-14 m
( less than 1/10 000 of that of the atom)
Where is almost all of the mass of atom located?
Nucleus
What is the relative mass of a proton?
1
What is the relative mass of a neutron?
1
What is the relative mass of an electron?
Very small, close to zero.
What is mass number?
The sum of the protons and neutrons in an atom.
What is an isotope?
An isotope is an element that has the same atomic number but a different number of neutrons.
What is relative atomic mass?
The weighted average mass of an element's isotopes.