20
20
20
If: 4 = 3/5s Then: s = 3/20
21 5s
The iPhone 5c and 5s came out on the same day. They were both released on September 20, 2013.
In the Rb atom, the electron configuration is [Kr]5s^1. This means there is 1 electron in the 5s sublevel of the Rb atom.
7
24
75
90
10