Can u explain me this points based on discovery of electrons

1)In absence of electrical or magnetic field these rays travel in straight line.

2)in presence of electrical or manetic field the behaviour of cathode rays are similar to that expected from negatively charged particle suggesting tha the cathode rays consist of negatively charged particle called electrons.

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane