Write the names of the following elements
Na, C, Kr, U, Ra, Fe, Co
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Na — Sodium
C — Carbon
Kr — Krypton
U — Uranium
Ra — Radium
Fe — Iron
Co — Cobalt
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Write the symbols of helium, silver, krypton, antimony, barium.
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.