9.
What are neutrons ?
A. Positively charged particles
B. B. Particles of negligible mass
C. Particles with zero electric charge
D. Particles with charge numerically
opposite in sign to that of electrons
10. What is the number of protons in a Uranium atom? (atomic number = 92)
A. 82
C. 72
B. 92
D. Cannot be determined
11. Which of the following particles is NOT found in the nucleus?
A.Proton
C. Electron
B.Neutron
D. Quarks
12. Which of the following statements is NOT correct?
A.The total mass of the protons and neutrons in an atom accounts for most mass of the
atom.
B. Neutrons have a charge equal to that of electrons.
C. The electron is the first subatomic particle
discovered.
D. Electron are negatively charge.
3.Chromium has a mass number 52 and atomic number of 24. Solve for number of protons?
A.24.
C. 52
B. 28
D. 76
an atom?
ha​