1. Element M reacts with fluorine to form an ionic compound with the formula MF3. The M-ion has 18 electrons. Element M is:
A. Cr
B. Sr
C. Ca
D. P
E. Ar
2. Of the three types of radioactivity characterized by Rutherford, which is/are electrically charged?
A. beta-rays
B. alpha-rays and beta-rays
C. alpha-rays
D. alpha-rays and gamma-rays
E. alpha-rays, beta-rays, gamma-rays
3. All atoms of a given element have the same
A. number of neutrons
B. density
C. number of protons
D. number of electrons and neutrons
E. mass
4. Which of the following molecular formulas is also an empirical formula?
A. C6H6
B. C2H6SO
C. H2O2
D. H2P4O6
E. C6H6O2
5. Which formula/name pair is incorrect?
A. Mn(NO3)2 Manganese(II) nitrate
B. Mn(NO2)2 Manganese(II) nitrite
C. Mg2N2 Magnesium nitrite
D. Mg(MnO4)2 Magnesium permanganate
E. Mg(NO3)2 Magnesium nitrate
A. Cr
B. Sr
C. Ca
D. P
E. Ar
2. Of the three types of radioactivity characterized by Rutherford, which is/are electrically charged?
A. beta-rays
B. alpha-rays and beta-rays
C. alpha-rays
D. alpha-rays and gamma-rays
E. alpha-rays, beta-rays, gamma-rays
3. All atoms of a given element have the same
A. number of neutrons
B. density
C. number of protons
D. number of electrons and neutrons
E. mass
4. Which of the following molecular formulas is also an empirical formula?
A. C6H6
B. C2H6SO
C. H2O2
D. H2P4O6
E. C6H6O2
5. Which formula/name pair is incorrect?
A. Mn(NO3)2 Manganese(II) nitrate
B. Mn(NO2)2 Manganese(II) nitrite
C. Mg2N2 Magnesium nitrite
D. Mg(MnO4)2 Magnesium permanganate
E. Mg(NO3)2 Magnesium nitrate