1. Which of the following isn't electrically neutral? A. Neutron
B. Atom C. Molecule
D. Proton
2. Which of the following element has no neutron partied particle?
A. Hydrogen B. Helium
C. Lithium
D. Sodium
3. Which one of the following is the heaviest sub-atomic particle?
A. Electron B. Helium
C Proton
D. Ion
4. The nucleus of an atom is positively charged due to
A. electrons b. neutrons C. proton D. Ion
5. The atomic nucleus consists of
and
particles
A. electron and proton
C. proton and electron
B. neutron and electron D. Proton and neutron
6. The first Greek philosopher who proposed the concept of an atom was
A. Dalton
C. Robert Boyle
B. Aristotle
D. Democritus