Electron affinity decreases down the groups and from right to left across the periods on the periodic table because the electrons are placed in a higher energy level far from the nucleus, thus a decrease from its pull. Keeping this in consideration, Why does electron affinity decrease down the periodic table? The less valence electrons an atom has, the least likely it will gain electrons. Why does electron affinity decrease as the size of an atom?Ĭonsequently, How does the electron affinity change with the number of shells? On moving from top to bottom in a group electron affinity decreases because number of shells increase s due to which nuclear charge decreases On moving from left to right in a period electron affinity increases due to increase in nuclear charge Īlso to know is, Why does electron affinity increase with increasing energy gain? This means that an incoming electron will be more attracted to the nucleus, which implies that the energy gain when it is added to the atom will be more significant → electron affinity increases. When a neutral atom gains or loses an electron, creating an anion or cation, the atom's radius increases or decreases. Neutral atoms tend to increase in size down a group and across a period. Thereof, Why do ionic radii increase down a group? One such trend is closely linked to atomic radii - ionic radii. The number of energy levels increases as you move down a group as the number of electrons increases. In this regard, How does the size of a neutral atom change across a period? Neutral atoms tend to increase in size down a group and across a period. For the group I A and II A for an example the losing of an electron causes the atom to be smaller than tthe neutral atom. One may also ask, What is the size of the atom before becoming an ion? The size of the atom before becoming an ion is larger as the atoms go down in a group or family. Similarly, What happens to the radius when an atom gains or loses electrons? When a neutral atom gains or loses an electron, creating an anion or cation, the atom's radius increases or decreases. Why does ionic size increase down a group? My doctor said drinking destroyed my liver. And this also happens due to shielding effect. įurthermore, Why does electron affinity decrease as the size of an atom? Electron affinity decreases as size of atom increases because the distance between the nucleus and the outermost orbital of atom get increase so the inter nucleur force between nucleus and coming electron get decreases. Similarly one may ask, Why does ionic size increase down a group? Why does ionic size increase down a group? The size of the atom before becoming an ion is larger as the atoms go down in a group or family.

As you move across a row of the periodic table, the ionic radius decreases for metals forming cations, as the metals lose their outer electron orbitals.

Ĭonsequently, Why does the size of an ion decrease as you add protons? It might seem counterintuitive that the size of an ion would decrease as you add more protons, neutrons, and electrons in a period. The ionic radius increases for nonmetals as the effective nuclear charge decreases due to the number of electrons exceeding the number of protons. Ĭonsequently, Why does the ionic radius of cations increase with increasing nuclear charge? Yet, there's an explanation for this. It might seem counterintuitive that the size of an ion would decrease as you add more protons, neutrons, and electrons in a period, yet, there's an explanation for this. Why does electron affinity decrease as the size of an atom?.Why does ionic size increase down a group?.

Electron affinity trend