Atoms Flashcards
1
Q
What is the nuclear symbol tell you?
A
Atomic (proton) number and mass number
2
Q
What does the atomic number tell you?
A
How many protons there are
3
Q
What does the mass number tell you?
A
The total number of proton in the atom
4
Q
How do you get the number of neutrons?
A
Subtract the atomic number from the mass number
5
Q
How did J.J Thompson discover electron?
A
Conduction of electricity through gases
6
Q
Using gold leaf and alpha particles, Rutherford,Geiger and Marsden discovered what
A
Positive nucleus in the centre of an atom
7
Q
Who came up with the electronic structure
A
Neils Bhor
8
Q
Why is an atom neutral
A
Positive protons and negative electrons cancel each other out
