When an atom gains an electron, its radius increases. Conversely, when an atom loses an electron, its radius decreases. The radius of an anion is larger than the radius of a neutral isoelectronic atom because there are fewer protons available to attract the same number of electrons.

The loss in an electron will consequently result in a change in atomic radii in comparison to the neutral atom of interest (no charge). The loss of an electron means that there are now more protons than electrons in the atom, which is stated above.

Neutral atoms tend to increase in size down a group and decrease across a period. When a neutral atom gains or loses an electron, creating an anion or cation, the atom’s radius increases or decreases, respectively.

(b) When an atom loses an electron, it forms a cation. The atomic radius is larger than the ionic radius. The nuclear charge remains the same but the number of electrons decreases by 1. Hence, the effective nuclear charge per electron increases.

The size of an element’s ionic radius follows a predictable trend on the periodic table. As you move down a column or group, the ionic radius increases. This is because each row adds a new electron shell. Ionic radius decreases moving from left to right across a row or period.

The pale green Fe2+ is oxidised to orange Fe3+ because it loses an electron. This is an oxidation reaction because there is a loss of electrons and an increase in oxidation number.

Phenolic compounds are relatively abundant constituents of plant roots (22) and many of the phenols, notably the ortho di-hydroxy phenols, are sufficiently strong reducing agents to be able to reduce Fe3+ to Fe2+ under condi- tions prevailing in the proximity of plant roots.

Fe2+ is forming an orange colored complex. So you will analyze first the Fe2+ and to another aliquot of the same sample ascorbic acid must be added so that all remaining Fe3+ will be reduced, then you measure Fe2+ again and the difference to the first measurement is the Fe3+.

H2O2

Dihydrogen

Thus hydrogen has least tendency to donate electron and is the weakest reducing agent.

Atomic hydrogen is obtained by passing hydrogen through an electric arc. Finely divided palladium adsorbs large volume of hydrogen gas.

Nascent hydrogen consists of hydrogen molecules with excess energy. The idea of nascent hydrogen was once used to describe dissolving-metal reactions including the Clemmensen and Bouveault–Blanc reductions. A special state of hydrogen was proposed because organic compounds do not react with H2 .

From Wikipedia, the free encyclopedia. Nascent hydrogen is a concept that was once invoked to explain dissolving-metal reactions, such as the Clemmensen reduction and the Bouveault–Blanc reduction. Since organic compounds do not react with H2, a special state of hydrogen was postulated.

1 : coming or having recently come into existence : beginning to develop nascent polypeptide chains.

In a flame of pure hydrogen gas, burning in air, the hydrogen (H2) reacts with oxygen (O2) to form water (H2O) and releases energy. If carried out in atmospheric air instead of pure oxygen, as is usually the case, hydrogen combustion may yield small amounts of nitrogen oxides, along with the water vapor.