Argon
If a compound contains at least one metal atom and at least one nonmetal atom, the compound is ionic. Na (Sodium) is a metal. Br (Bromine) is a nonmetal. Therefore, the compound NaBr is ionic.
Plutonium is least likely to have been a component of Earth as it is a man-made element that is not naturally occurring in significant quantities.
Copper (Cu) is the least likely to be reduced because it is already in its elemental state, so it would require more energy to further reduce it compared to nickel (Ni), iron (Fe), and sodium (Na) which are more reactive and easier to reduce.
The least likely salt found in minerals is sodium chloride, also known as table salt. Although sodium chloride is a common mineral, it is not found in naturally occurring crystals in the same way as other mineral salts like halite or sylvite. Sodium chloride is primarily obtained through evaporation of seawater or salt flats.
Oxygen is least likely to form an ion because it has a high electronegativity and tends to gain electrons rather than lose them, making it less likely to form a positive ion (cation).
It is sodium metal.
Ionic compounds do not require the presence of a metal, for example ammonium chloride is ionic and does not contain a metallic element. What is true is that the majority of ionic compounds involve at least one metal.
Among the naturally occurring elements, the most likely one would be cesium, the least electronegative of all elements. In practice, any of the other alkali metals and any of the alkaline earth metals would usually react readily with chlorine gas, as would many of the transition metals.
Magnesium is the least reactive element among magnesium, chlorine, rubidium, and sodium. It belongs to the alkali earth metals and has a low reactivity due to its stable electronic configuration.
NH3 is least likely to be ionic among the compounds mentioned. NH3 is a covalent compound consisting of a single nitrogen atom bonded to three hydrogen atoms. The other compounds - CaF2, Na2O, and MgBr2 - are ionic compounds formed by the transfer of electrons from a metal to a nonmetal.
Ionic bonds can be found in elements that have a tendency to lose or gain electrons to achieve a full outer shell. Elements from opposite sides of the periodic table often form ionic bonds, such as metals like sodium or potassium, which tend to lose electrons, and nonmetals like chlorine or oxygen, which tend to gain electrons.
Nobel gasses.
The element least likely to be found in the molecules of living organisms is francium. Francium is a highly reactive and radioactive element that is extremely rare in nature and has a very short half-life.
If a compound contains at least one metal atom and at least one nonmetal atom, the compound is ionic. Na (Sodium) is a metal. Br (Bromine) is a nonmetal. Therefore, the compound NaBr is ionic.
Ionic compounds do not require the presence of a metal, for example ammonium chloride is ionic and does not contain a metallic element. What is true is that the majority of ionic compounds involve at least one metal.Most ionic compound include a metal because metals readily form positive ions while nonmetals do not, with the exception of some polyatomic ions.
Plutonium is least likely to have been a component of Earth as it is a man-made element that is not naturally occurring in significant quantities.
It's Phosphorus I actually believe the answer is sodium. The American diet is very high in sodium.