Cathode rays are streams of negatively charged particles, typically electrons, emitted from the cathode during electrolysis. Their negative charge is a fundamental property, distinguishing them from other types of rays like anode rays, which are positively charged, and gamma rays, which have no charge. This property is crucial in understanding their behavior and applications.

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The Stark effect is a phenomenon in atomic physics where spectral lines emitted by atoms split into multiple components when the atoms are subjected to a strong electric field.

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Molten NaCl dissociates into freely moving sodium (Na+) and chloride (Cl-) ions. These ions carry electrical charge, allowing for the flow of electricity.

Chlorine has the maximum electron affinity due to its electronic configuration, which allows it to readily accept an electron, releasing energy in the process. This is a result of its relatively small size and the effective nuclear charge.

Ionization energy is the energy required to remove an electron from an atom. It is influenced by the nuclear charge, atomic size, and shielding effect, as well as the nature of the orbital from which the electron is being removed.

Greater shielding effect means that the outermost electrons are more shielded from the nuclear attraction, resulting in a lower ionization energy value, which is the energy required to remove an electron from an atom.

Carbon is a highly reactive metal, which makes it an ideal reducing agent in smelting processes, allowing it to extract metals from their ores.

The fourth period of the periodic table begins with Potassium (atomic number 19) and ends with Krypton (atomic number 36). This period includes the s-block elements (K, Ca), the d-block transition metals (Sc through Zn), and the p-block elements (Ga through Kr), totaling 18 elements.