a. How many elements are known to us at present?
b. Write the symbols of the following elements
Iron, Cobalt, Copper, Carbon, Calcium

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Solution

a. At present, 118 elements are known to us.
b. Chemical Symbol: A chemical symbol is a shorthand method of representation of an element using one or two letters for consistency.
Iron: Fe
Cobalt: Co
Copper: Cu
Carbon: C
Calcium: Ca

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Which of the following symbols of elements are incorrect? Give their correct symbols

(a) Cobalt CO

(b) Carbon c

(d) Helium He

(e) Sodium So

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