A nucleus contains only positrons and neutrons, which have a positive and neutral charge, respectively. The electrons (with a negative charge) orbit around the nucleus. So, a nucleus in and of itself is positively charged.
An atom has the same number of positive protons and negative electrons so the charges balance out to zero
neutron
This is the neutron.
The magnesium atom is electrically neutral.
A nucleon is one of the particles that make up the nucleus of the atom. Protons and neutrons are nucleons, and the neutronis the electrically neutral nucleon.
The atomic nucleus is not neutral, it is positively charged (the exact charge depends upon the element in question; the hydrogen nucleus is +1, the helium nucleus is +2, etc). The atom as a whole is electrically neutral, unless it becomes ionized.
Even an electron excited to a higher than normal energy level remains sufficiently close to the nucleus of its atom that the atom as a whole remains neutral.
A nucleus contains only positrons and neutrons, which have a positive and neutral charge, respectively. The electrons (with a negative charge) orbit around the nucleus. So, a nucleus in and of itself is positively charged.
An electrically neutral atom is one that has an equal number of protons and electrons.
Protons are electrically positive charged, electrons are electrically negative charged, neutrons are electrically neutral. The number of electrons and protons is equal in a neutral atom. Protons and neutrons are in the atomic nucleus, electrons on electron shells, forming electron clouds.
All atoms are electrically neutral. If an atom gains or loses an electron, we call it an "ion" rather than an atom.
Because an electrically neutral atom has an equal number of protons and electrons.