positively charged due to amino groups of its protein tail,the globin.But the medium is negatively charged.
There is no net electrical charge on an "unreacted" atom.
Gained or lost electron(s).
All ions have an electrical charge.
Atoms are neutrally charged if they have equal numbers of protons and electrons. Technically speaking, all atoms have no net electrical charge - ions have a positive/negative charge.
In the atomic nucleus the neutron has no electrical charge.
Electrical charges are conserved, meaning that any net electrical charge was present since the beginning of the Universe. I would expect the net electrical charge of the Universe to be zero; it is also possible to get electrical charges by separation of charges. That is, if you have a charge of 0, you can separate it into a charge of +1 and a charge of -1; the sum of the two charges is still zero.
A particle with no net electrical charge, such as a neutron.
By losing electrons.
Neutral atoms always have a net charge of 0(zero).
The atom is neutral,, there is no net charge
It is an ion.
Sodium chloride is neutral.