Explanation: When an atom gains an electron, it has more electrons (negative) than protons (positive). This means that it has an overall negative charge, and is called an anion (not to be confused with onion).

Table of Common Element Charges

Similarly, it is easier for oxygen to gain 2 electrons instead of loosing 6 electrons: Oxygen Ion. The two gained electrons (purple dots) means that this oxygen ion has 10 electrons (-10 charge) and only 8 protons (+8 charge), giving the ion a net charge of -2. Symbolically, we can represent this oxygen ion as O-2.

Therefore, when atoms from a metallic and a nonmetallic element combine, the nonmetallic atoms tend to draw one or more electrons away from the metallic atoms to form ions. These oppositely charged ions then attract one other to form ionic bonds and produce ionic compounds with no overall net charge.

Answer: Explanation: When an atom gains an electron, it has more electrons (negative) than protons (positive). This means that it has an overall negative charge, and is called an anion (not to be confused with onion). 18 negative electrons compared with 17 positive protons means the ion is negatively charged.

O

Chromate (CrO42-), hydrogen.

As the name suggests carbon dioxide is a type of oxide. Oxygen can react with metals and non – metals to form compounds which contain oxygen and another element of metal or non-metal. Oxides can be divided into four types. Many elements get oxidized in air or water naturally.

Based on their acid-base characteristics oxides are classified as acidic, basic, amphoteric or neutral: An oxide that combines with water to give an acid is termed as an acidic oxide. The oxide that gives a base in water is known as a basic oxide.

General Rules. In general, the electropositive character of the oxide’s central atom will determne whether the oxide will be acidic or basic. The more electropositive the central atom the more basic the oxide. The more electronegative the central atom, the more acidic the oxide.

GeO2reacts with acid an base both so, it is an amphoteric oxide. Tin oxide SnO2reacts with hydrochloric acid and sodium hydroxide both so, it is amphoteric.

Na2O is more basic oxide. The trend of basicity is from strongly basic oxides on the left-hand side to strongly acidic ones on the right, via an amphoteric oxide (aluminium oxide) in the middle. MgO isn’t as strongly basic as Na2O because the oxide ions in MgO aren’t so free to combine with H+ ions.

Lithium monoxide

Aluminum Oxide Aluminium oxide is amphoteric. It has reactions as both a base and an acid. Reaction with water: Aluminum oxide is insoluble in water and does not react like sodium oxide and magnesium oxide. The oxide ions are held too strongly in the solid lattice to react with the water.

BeO

While oxides of Aluminium will be amphoteric in nature, i.e., they will show both acidic as well as basix character. Therefore, Al2O3 is strongest acid among these.

Na2O, MgO, CaO are metallic oxide of s block. These maetallic oxides powerful bases, while Al2O3 is metallic oxide of p block which has comapratively more acidic character. Hence, it is the most acidic oxide among all.

ANSWER: Proton (a) is the most acidic.

Phenol is more acidic than aliphatic compounds containing OH group due to resonance stabilization of phenoxide ion by the aromatic ring. In this way negative charge of oxygen atom is delocalized on ortho and para carbon atoms. Due to which stability increases.

Hence, p−nitrophenol is most acidic among the given.