physics Flashcards
1
Q
where is the atomic mass of an element found
A
the top number
2
Q
where is the atomic number of an element found
A
the bottom number
3
Q
protons charge?
A
+1
4
Q
neutrons charge?
A
0
5
Q
electrons charge?
A
-1
6
Q
what is an ion
A
an atom that has gained or lost electrons
7
Q
what did dalton discover
A
all elements are composed of indivisible, small particles(atoms)
8
Q
what did jj thompson discover
A
the electron
9
Q
what did rutherford discover
A
alpha and beta rays
10
Q
what did bohr discover
A
that electrons travel in separate orbits around the nucleus and that the number of electrons in the outer orbit determines the properties of an element
11
Q
A
