Chemistry
Atoms of different elements have

Same number of electrons and neutrons
Different atomic number and different number of valence electrons
Different atomic number and same eletronic configu-ration
Same atomic number and same electronic configuration

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

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

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