Which of the following has the largest effective nuclear charge?
sodium cation
What happens to the effective nuclear charge down a group?
In general, ionization energy increases across a period and decreases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant. Down a group, the number of energy levels (n) increase and the distance is greater between the nucleus and highest-energy electron.
How does Zeff increase down a group?
The overall effective nuclear charge experienced by the valence electron in question is Zeff. The effective nuclear charge, Zeff, increases down a group which draws electrons closer towards the nucleus, decreasing atomic radius.
Is Zeff a constant group?
The size of the atom increases going down a group. Going down a group, distance and shielding increase. Effective Nuclear Charge (Zeff) remains constant.
Why does the effective nuclear charge Zeff remain relatively constant for each element down a group?
Therefore, the nuclear charge of outer shell electrons stays relatively constant for each element down a group. This is because the number of additional protons in each element’s nucleus is equal to the number of additional shielding electrons in the inner energy levels of the atom.
What is the most likely electron configuration for a sodium ion in its ground state?
Examples: Na has a ground-state electronic configuration of 1s2 2s2 2p6 3s1. Removing the 3s electron leaves us with the noble gas configuration 1s2 2s2 2p6, so a sodium ion is Na+.
How many electron shells does sodium ion have?
So… for the element of SODIUM, you already know that the atomic number tells you the number of electrons. That means there are 11 electrons in a sodium atom. Looking at the picture, you can see there are two electrons in shell one, eight in shell two, and only one in shell three.
What is the electron configuration of the sodium Na atom after it loses an electron?
The electronic configuration of sodium ion becomes 2,8 on losing one electron.