1. Which of the following is true?
A. Cesium is the most active group 1 metal, because its valence electron is held more tightly than the others in the same group.
B. Group 1 elements are more reactive than the group 2 elements because they have more valence electrons to lose.
C. Lithium is the least reactive element in group 1, because it is the smallest and holds its valence electron more tightly than the others in the same group.
D. The least reactive element in group 2 is the one with the largest atomic radium and the least amount of attraction between the nucleus and the valence electrons.
2. Which of the following is not true of polar covalent bonds?
A. Polar covalent bonds create two poles across the bond.
B. Polar covalent bonds result from the unequal sharing of electrons.
C. Electronegativity differences for atoms with polar covalent bonds range between 0.5 and 2.0.
D. Polar covalent bonds exist between atoms of the same element.
3. Which element has the electron configuration 1s22s22p63s23p3?
A. Phosphorus
B. Arsenic
C. Krypton
D. Scandium
4. Covalent bonding (with an electro negativity difference below 0.5) results when fluorine bonds with
A. hydrogen.
B. potassium.
C. iodine.
D. fluorine.