![Picture](/uploads/2/2/5/2/22529028/5817204.jpg?243)
Core Notation
By Bernadeth Castilleja
Core notation
Core notation is the set of electron having configuration to the nearest Nobel gas (He, Ne, Ar, Kr, Xe, Rn). And it is the shortcut of Mnemonic Device.
Rules:
1. Locate the atom and note the nobel gas before the row or above the location of the atom.
2. Place brackets [ ] into the noble gas. And follow the core symbol with the remaining outer electron.
By Bernadeth Castilleja
Core notation
Core notation is the set of electron having configuration to the nearest Nobel gas (He, Ne, Ar, Kr, Xe, Rn). And it is the shortcut of Mnemonic Device.
Rules:
1. Locate the atom and note the nobel gas before the row or above the location of the atom.
2. Place brackets [ ] into the noble gas. And follow the core symbol with the remaining outer electron.
![Picture](/uploads/2/2/5/2/22529028/4501603.gif?357)
S shell includes 1-7period , d shell includes 3-6 period, p shell includes 2-7 period, and f includes only 4 and 5 period.
Here are some examples:
a. I53 = [Kr]5s2 4d10 5p5
b. Rn86 = [Xe]6s2 5d10 6p6
Note:
The [Kr] represent the 36 inner electron while the 5s2 4d10 5p5 represent the outer electron outside the Nobel gas core. And the numbers 2, 10, and 5 or simply the exponents are the valence electron while the 5, 4, and 5 are the highest energy level.
Use the noble gas Xe in answering letter b because you need to show th electron configuration.
Here are some examples:
a. I53 = [Kr]5s2 4d10 5p5
b. Rn86 = [Xe]6s2 5d10 6p6
Note:
The [Kr] represent the 36 inner electron while the 5s2 4d10 5p5 represent the outer electron outside the Nobel gas core. And the numbers 2, 10, and 5 or simply the exponents are the valence electron while the 5, 4, and 5 are the highest energy level.
Use the noble gas Xe in answering letter b because you need to show th electron configuration.