In beta decay, an electron (or a positron) is emitted by a nucleus. Does the remaining atom get oppositely charged?

In an experiment on photoelectric effect, a photon is incident on an electron from one direction and the photoelectron is emitted almost in the opposite direction. Does this violate conservation of momentum ?

A diode valve is connected to a battery and a load resistance. The filament is heated so that a constant current is obtained in the circuit. As the cathode continuously emits electrons, does it get more and more positively charged?

In a Coolidge tube, electrons strike the target and stop inside it. Does the target get more and more negatively charged as time passes?

The Bohr atom model is derived with the assumption that the nucleus of the atom is stationary and only electrons revolve around the nucleus. Suppose the nucleus is also in motion, then calculate the energy of this new system.

An atom can contain protons which have a positive charge(+) and electrons which gave negative charge (-). When an electron and a proton pair up, they become neutral (0) and cancel the charge out. Now determine the net charge: 5 electrons and 3 protons rarr

An atom can contain protons which have a positive charge(+) and electrons which gave negative charge (-). When an electron and a proton pair up, they become neutral (0) and cancel the charge out. Now determine the net charge: 6 protons and 6 electrons rarr