Table of Contents
- 1 Why is the electron affinity of beryllium and magnesium zero?
- 2 Why does beryllium have lower electron affinity?
- 3 Which element will have an electron affinity 0 kJ mol?
- 4 Why does electron affinity decrease down a group?
- 5 Why electron affinity of beryllium is positive?
- 6 Which of the following are the values of electron affinity in kJ?
- 7 Why does electron affinity decrease down the group?
- 8 What is the electron affinity of magnesium kJ mol?
- 9 Why is the electron affinity of beryllium zero?
Why is the electron affinity of beryllium and magnesium zero?
electron affinity of Be, Mg, N are almost zero explain Be 1s22s2 has a filled valence shell, so it does not have the tendency to gain electrons. Thus its electron affinity is almost zero. Mg(2,8,2) also has filled valence shell, so its electron affinity is zero.
Why does beryllium have lower electron affinity?
Well, beryllium has a POSITIVE electron affinity, because it gets less stable when we try to fill the next orbitals, the 2p orbitals… but I suppose even atoms can dislike certain electoral processes… And so, it takes energy input in order to place a new electron into a 2p orbital. Thus, EA(Be)>0 .
Which element will have an electron affinity 0 kJ mol?
Helium
Electron Affinity of the elements
| Helium | 0 kJ/mol | 50 kJ/mol |
|---|---|---|
| Mercury | 0 kJ/mol | 53.7 kJ/mol |
| Radon | 0 kJ/mol | 59.6 kJ/mol |
| Calcium | 2.37 kJ/mol | 63.7 kJ/mol |
| Strontium | 5.03 kJ/mol | 64.3 kJ/mol |
Does beryllium have zero electron affinity?
Answer: Electron affinities of beryllium and nitrogen are almost zero. This may be due to the extra stability of the completed 2s-orbital in beryllium and of the exactly half-filled p-orbital in nitrogen.
What is the electron affinity of magnesium?
Elements
| Z | Element | Electron affinity (eV) |
|---|---|---|
| 10 | Ne | -1.2(2) |
| 11 | Na | 0.547 926(25) |
| 12 | Mg | -0.4(2) |
| 13 | Al | 0.432 83(5) |
Why does electron affinity decrease down a group?
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.
Why electron affinity of beryllium is positive?
Electron-electron repulsion between two electrons in the same 2p orbital is high. e. Beryllium has a high electronegativity.
Which of the following are the values of electron affinity in kJ?
-142 , -142.
Why does electron affinity increase as atomic size decreases?
A more negative energy per mole means that more energy is given off when the atom adds an electron, so electron affinity increases!
Why is electron affinity of fluorine less than chlorine?
Electron affinity of fluorine is less than that of chlorine. This is due to the reason explained below: Fluorine has seven electrons in 2p-subshell whereas chlorine has seven electrons in its 3p-subshell. Therefore, repulsion among the electrons will be more in the 2p-shell of fluorine than 3p-subshell in chlorine.
Why does electron affinity decrease down the group?
What is the electron affinity of magnesium kJ mol?
Electron Affinity of Magnesium. Electron affinity of Magnesium is — kJ/mol. In chemistry and atomic physics, the electron affinity of an atom or molecule is defined as: the change in energy (in kJ/mole) of a neutral atom or molecule (in the gaseous phase) when an electron is added to the atom to form a negative ion.
Why is the electron affinity of beryllium zero?
For beryllium and magnesium the electron affinity isn’t really that close to zero, it’s firmly on the negative side. When another electron is added it goes to a p type orbital, which is much higher in energy than s type orbitals.
What is the trend in electron affinity between magnesium and be?
The general trend is that electron affinity increases from left to right in the Periodic Table. Be and Mg are the two Group 2 elements closest to the head of the red arrow. Unlike most elements, they have Eea ≤ 0. Why are beryllium and magnesium so different?
What is electelectron affinity?
Electron affinity refers to tendency of an element to attract electrons. Both Be and Mg have 1 and 2 valence electrons respectively.