Science Periodic Table of Elements

Which of these is NOT an element?
A. Mercury
B. Metal
C. Manganese
D. Magnesium
Out of all of the options, select the ones that are NOT elements.
Krypton
Alententic
Barium
Hafnium
Gantoliom
Concrete
Einsteinium
Osmium
Colontolium
Mercolium
Lithium
Niobium
Name 15 things from the periodic table.
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