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
abhinav behal
15-Feb-2020