Chemistry
The Latin word formica means ant. The name formic acid is derived from this Latin word because

ants are attracted by the odour of this acid
this acid, in ancient times, was used to eliminate ant-hills
this acid was first obtained by the distillation of ants
this corrosive acid is secreted by ants to drive away their enemies

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Chemistry
The mass number of a nucleus is

a fraction
always more than the atomic weight
always less than its atomic number
the sum of the number of protons and neutrons present in the nucleus

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