Date: _____________________ Name: _________________________
1
Modern Atomic Theory
1. Why did Rutherford’s discovery of the atomic nucleus cause Thomson’s “plum pudding”
model of the atom to be abandoned?
2. According to Rutherford’s model of the atom, what existed in the nucleus of the atom?
3. Early chemists believed that atoms were indivisible and had no internal structure. What effect
did the work of Thomson have on such ideas?
4. How did the work of Dalton allow an expansion of chemical manufacturing?
5. How many protons are in the nucleus of each of the following?
a) Be
b) U
c) Mn
6. How many electrons are there in a neutral atom of each of the following?
a) C
b) Fe
c) Ar
