Electron Configuration Flashcards
1
Q
What is the electron configuration of an atom?
A
It shows how the electrons are arranged in shells around the nucleus
2
Q
Step 1. What do the electrons in the atom fill up?
A
The lowest energy level first. This is the shell closest to the nucleus
3
Q
Step 2. How many electrons can the first shell hold?
A
Up to two
4
Q
Step 3. How many electrons can shells after the first hold?
A
Up to eight
5
Q
What is electron configuration written as a series of what?
A
Numbers
6
Q
Give examples of this
A
eg. 2,8,1 Going across a period, electron configurations increase by one
eg. Sodium 2,8,1, magnesium 2,8,2, aliminium 2,8,3 until the shells is full eg. Argon 2,8,8
7
Q
What is this only true for?
A
The first 20 elements.
