The Periodic Table and the Atom - Size and Mass of Atoms Flashcards
1
Q
Atoms are very small, roughly how big?
A
they have a radius of roughly 0.1nm (1x10^-10m)
2
Q
How much less is the radius of the nucleus than that of the atom
A
the radius of a nucleus is less than 1/10,000th of that of the atom (about 1x10^-14m)
3
Q
Where is almost all of the mass of the atom located
A
the nucleus
4
Q
What are the relative masses of
1) protons
2) neutrons
3) electrons
A
1) 1
2) 1
3) very small
5
Q
what is an atoms mass number
A
the sum of the protons and neutrons in that atom
6
Q
what is the name for atoms of the same element but with different numbers of neutrons
A
isotopes of that element
7
Q
what is an atoms atomic number?
A
the number of protons in an elements nucleus
