Electrons
Net positive.
No an electron does not have a net charge of 0, in fact it has a net charge of -1.
In that case, the net force on the object is zero.
A net charge results when an atom gains or loses electrons. If it loses electrons, it gains a positive charge, if it gains them, it gains a net negative charge.
An atom is composed of proton (p+) with a charge of +1, neutrons, and electrons (e-) of -1. The net charge of the object is thus sum of the p+ and e-. Net charge can be negative, neutral or positive.
If the positive and negative charges are equal, then the object has a 'net' neutral charge.
Electrons can move from object to object. Electrons have a negative charge. So if an object is determined to have a positive charge, then some of the electrons have moved from the object to somewhere else. Something with a neutral charge has the same number of electrons [-] and protons [+]. If electrons [-] leave, then there will be more protons, and a net positive charge. If an object gains electrons, then the object has a net negative charge.
It depends on the type of non-charged object. If the object is made of conductive material, a charged object will induce a separation of charge in the non-charged object. Its net charge will still be zero. If the object is not conductive, there will be no significant effect.
If a neutral object loses negative charge, then all we can say is that the objectwill be positively charged. We don't know anything about force until we knowhow much net positive charge it has, what othercharged object is in theneighborhood, what the size and sign of thatone's charge is, and the distancebetween the two objects.
Electrons
positive
It does not acquire any charge, it looses negative charge (the electrons), so becomes net positive.
Net positive.
neutral (not sure if there's a different concept that you're looking for here)
The net charge is the total amount of charge that the ion will have. So you will find out the charge of each group and add them all together for the net charge.
A sodium atom has a net charge of zero. A sodium ion has a net charge of 1+.