sc3, atomic structure (paper 1 and 2) Flashcards
1
Q
can atoms be broken down, created, or broken down into smaller parts
A
no lol
2
Q
what is the mass number
A
protons + neutrons
3
Q
what is the atomic number
A
protons
4
Q
define isotope
A
different forms of the same element that have the same number of protons but a different amount of electrons
5
Q
equation for relative atomic mass
A
(isotope mass x isotope abundunce) / by 100
6
Q
what experiment discovered that atoms were mostly empty space
A
.Nuclear atom experiment (1909 by Ernest Ruthford)
7
Q
what happened in the Nuclear atom experiment (1909 by Ernest Ruthford)
A
- positive particles were fired at at thin gold foil
- most of it passed through with few deflecting back
- it was explained that atoms are mostly empty space, with a small positive central nucleus containing most of the mass
