Chemistry
The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is

metamerism
chain isomerism
positional isomerism
functional group isomerism

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Chemistry
Atoms of different elements have

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

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