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Understanding the basics of protons and electrons is essential when discussing electric charge. Protons are positively charged particles found in the nucleus of an atom. Their main role is contributing to the mass and charge of the atom. Each proton has an electric charge of approximately \(1.6 \times 10^{-19}\) coulombs.

Electrons, on the other hand, are negatively charged particles located in the electron cloud surrounding the nucleus. They have an equal but opposite charge to protons, which is \(-1.6 \times 10^{-19}\) coulombs. This means they can effectively neutralize the positive charge of protons if present in equal numbers.

For a neutral atom, the number of protons equals the number of electrons, balancing out the total charge. However, if electrons are added or removed, the atom becomes charged, forming what is known as an ion.

Ionization is the process by which an atom or a molecule gains or loses electrons, resulting in a net electric charge. It transforms a neutral atom or molecule into an ion, which can be either positively or negatively charged.

• Positive ion (cation): Formed when an atom loses electrons. It has more protons than electrons, resulting in a positive charge.
• Negative ion (anion): Formed when an atom gains electrons, resulting in more electrons than protons, giving a negative charge.

This is particularly significant in contexts like the sun's outer atmosphere, where high energy conditions can strip electrons from atoms. This stripping leaves behind positively charged ions, as seen with iron ions which can lose many electrons due to the surrounding environment.

In the exercise, the iron atom becomes ionized by losing 19 of its 26 electrons, retaining only 7, which results in a net positive charge.

Coulomb's Law is a fundamental principle describing the electrostatic interaction between charged particles. It explains how the force between two charged objects acts and how the magnitude of this force is determined.

According to Coulomb's Law, the force \( F \) between two point charges \( q_1 \) and \( q_2 \) is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance \( r \) between them:\[F = k \frac{|q_1 q_2|}{r^2} \]Here, \( k \) represents the electrostatic constant, approximately \(8.99 \times 10^9 \text{ N} \cdot \text{m}^2/\text{C}^2\).

The law is vital in calculating forces in simple electric systems and understanding interactions at an atomic level. It is essential when considering the attraction between electrons and protons or evaluating forces within ionized gas clouds, such as those found in stellar atmospheres, where charged particles constantly interact.