Which of the following elements does not occur as a diatomic molecule

Which of the following elements does not occur as a diatomic molecule

 Which of the following elements does not occur as a diatomic molecule?

A)  iodine    B)  fluorine    C)  nitrogen    D)  hydrogen    E)  carbon

82.              Which of the following elements does not occur as a diatomic molecule?

A)  oxygen    B)  fluorine    C)  nitrogen    D)  neon    E)  iodine

83.              To which class does the element chromium belong?

A)representative (main-group) elementsD)actinides

B)transition elementsE)metalloids

C)lanthanides

84.              To which class does the element uranium belong?

A)representative (main-group) elementsD)actinides

B)transition elementsE)metalloids

C)lanthanides

85.              To which class does the element calcium belong?

A)representative (main-group) elementsD)actinides

B)transition elementsE)metalloids

C)lanthanides

86.              Select the element that is an alkali metal in Period 3.

A)  Na    B)  Mg    C)  Al    D)  K    E)  Ca

87.              Select the element that is a halogen in Period 5.

A)  Br    B)  Xe    C)  Te    D)  I    E)  N

88.              Select the element that is an alkaline earth metal in Period 4.

A)  Mg    B)  Sr    C)  K    D)  C    E)  Ca

89.              In which group of the periodic table do the elements not form ions?

A)alkaline earth metalsD)noble gases

B)alkali metalsE)chalcogens

C)halogens

90.              The ions of most main-group elements have the same number of ________ as the noble gas that is closest to them in the periodic table.

A)neutronsD)protons and electrons

B)protonsE)neutrons and electrons

C)electrons