Chemistry
(a) Name the three classes in which elements are classified. Which was the first metal used by man?
(b) Name the metal and non-metal present in abundance in the earth crust.
Metallurgy
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Answer
(a) The three classes in which elements are classified are –
- metals,
- non-metals and
- metalloids.
Copper was the first metal used by man for making utensils, weapons and for other purposes.
(b) The most abundant metal present in the earth’s crust is Aluminium and the most abundant non-metal present in the earth’s crust is Oxygen.
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