Topic 1- Size And Mass Of Atoms: Flashcards
1
Q
What is the estimated radius of atoms and nucleus?
A
Atoms are very small and have a radius of about 0.1nm.
The radius of a nucleus is less than 1/10,000 of the atom ( even though the nucleus holds almost all of the mass).
2
Q
What is the relative mass of a proton?
A
1
3
Q
What is the relative mass of a neutron?
A
1
4
Q
What is the relative mass of an electron?
A
Around 0.0005 (very small)
5
Q
What is the mass number?
A
The mass number is the sun of the protons and neutrons in an atom.
6
Q
What is an isotope?
A
An isotope is Atoms of the same element with the same amount of protons and different numbers of neutrons.
7
Q
How do u find the amount of neutrons?
A
Mass number - Atomic number
