What particle did chadwick discover in 1932 that was hard to detect because it had no electrical charge?

Neutron

Explanation:

Neutron is a sub-atomic particle which does not have any charge. It is present in the nucleus of an atom along with the protons. Both protons and neutrons are responsible for mass of an atom. Neutrons were hard to detect because of lack of electric charge. In an experiment, he bombarded Beryllium with alpha particles, high energy radiation was released which was not deflected by magnetic field. On studying more properties, the particle was named as neutron.

positive reinforcement? ?

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

explanation: