Monday
September 1, 2014

Homework Help: Chemistry

Posted by c on Friday, January 11, 2013 at 8:06am.

Shown below are several options for the box notations of the ground state electron configuration of the following gas-phase species. Identify the correct electronic configuration.
i. Al2−









ii. Mn









(a)Select the reason that best explains why the first ionization energy decreases as atomic number increases for the alkali metals (Li, Na, K, Rb, Cs).


The higher the atomic number, the greater the force of attraction between the nuclear charge and an electron. As the force is inversely related to the energy required to liberate an electron from that force, the first ionization energy decreases as the force of attraction felt increases.

The outermost shell becomes occupied with a greater number of electrons as the atomic number increases resulting in greater electron-electron (a.k.a Born) repulsion, which in turn makes it easier to ionize one of these electrons.

All of these elements are in the same group, and have the same valence shell electron configuration. Even though the nuclear charge increases with atomic number, the outermost electronís distance from the nucleus and the effectiveness with which inner electrons screen this greater nuclear charge both result in a net decrease in ionization energy.

The increase in ionization energy observed above is unrelated to the increasing atomic number, and instead has to do with the greater gravitational force of attraction to the heavier atomic nuclei.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

AP Chemistry - Which of the following electron configurations correspond to an ...
Chemistry - electron configuration - Hello Dr.Bob. Could you please take a look ...
electronic configuration - how do you figure out electronic configuration of ...
chemistry - Identify the neutral element represented by this excited-state ...
Chemistry - Use these answers for questions 4 - 7. (A) 1s2 2s22p5 3s23p5 (B) 1s2...
chemistry - electron configuration(check) - is the below the correct electronic ...
Chemistry - Ag+2 is generated in a lab. This is an unusual oxidation state for ...
Chemistry - Consider the following electron configuration. (σ3s)2 (σ3s...
Chemistry - Consider the following electron configuration. (σ3s)2 (σ3s...
Chemistry - What is the electron configuration called that has 18 electrons in ...

Search
Members