Name the main metal present in the following:
(a) Haemoglobin
(b) Chalk
(c) Chlorophyll
(d) Chocolate wrappers
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(a) Iron
(b) Calcium
(c) Magnesium
(d) Aluminium
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Write the names of the following elements
Na, C, Kr, U, Ra, Fe, Co
Define:
(a) Elements
(b) Compounds
Give four examples of non-metallic elements.
What do you understand by:
(a) Metalloids
(b) Noble gases
Give two examples of each.