Write the symbols of helium, silver, krypton, antimony, barium.
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Helium (He)
Silver (Ag)
Krypton (Kr)
Antimony (Sb)
Barium (Ba)
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Write the names of the following elements
Na, C, Kr, U, Ra, Fe, Co
Define:
(a) Elements
(b) Compounds
Name the main metal present in the following:
(a) Haemoglobin
(b) Chalk
(c) Chlorophyll
(d) Chocolate wrappers
Give four examples of non-metallic elements.