The distance from the sun to Neptune is about the same as the distance from Neptune to the next closest star, Proxima Centauri
When a planet like earth is closer to the sun the heat of the sunlight warms the surface of the planet hence,a planet like Neptune is far away from sun, the sunlight can't reach the planet and it's surface becomes cold so,the distance of the sun and planet is the main factor effecting the temperature.
The pair of atoms that will form an ionic compound is "One atom of calcium and two atoms of chlorine.". The correct option is B.
In an ionic compound, one atom gives up one or more electrons to another atom, resulting in positively charged cations and negatively charged anions that are attracted to each other due to electrostatic forces.
Here in the question
In option B, calcium (Ca) has two valence electrons, while chlorine (Cl) has seven valence electrons. To obtain a stable octet configuration, calcium will lose two electrons to form a Ca2+ cation, and two chlorine atoms will each gain one electron to form Cl- anions. The resulting compound, CaCl2, is an ionic compound with a crystal lattice structure held together by electrostatic forces between the oppositely charged ions.
Option A involves two non-metals, and they typically form covalent compounds, not ionic compounds.
Option C is similar to option A and also involves two non-metals, which typically form covalent compounds.
Option D involves two non-metals, and although the atoms can bond covalently, the compound formed would be a polar molecule, not an ionic compound.
Therefore, The correct option is B i. e One atom of calcium and two atoms of chlorine which forms an ionic compound.
To know more about covalent bonds click: