Question:
Which of the following symbols of elements are incorrect? Give their correct symbols:
(a) Cobalt Co
(b) Carbon C
(c) Aluminium $\mathrm{Al}$
(d) Helium He
(e) Sodium So
Solution:
(a) Incorrect; correct symbol is Co
(b) Incorrect; correct symbol is $C$
(c) Incorrect; correct symbol is Al
(e) Incorrect; correct symbol is $\mathrm{Na}$.