# In what way are the electron configurations of H, Li, Na, K, Rb, and Cs similar? More than one...

## Question:

In what way are the electron configurations of H, Li, Na, K, Rb, and Cs similar? More than one answer is possible.

a. They belong to a mathematical progression in atomic number such that Z + 8 describes the next atomic number.

b. They all have an unpaired electron in an s orbital.

c. They all have an unpaired electron with a magnetic quantum number, m{eq}_l {/eq} = 0.

d. They all have an unpaired electron with an angular momentum quantum number, l = 0.

e. They all have an unpaired electron with a spin magnetic quantum number, m{eq}_s {/eq} = +1/2.

f. They an have an unpaired electron with a spin magnetic quantum number, m{eq}_s {/eq} = - 1/2.

## Quantum Numbers & Electronic Configuration:

The set of four quantum numbers of a particular electron in an atom is unique. The principal quantum number n can have the values 1, 2, 3 and so on.

The Azimuthal quantum number l can have the values between 0 and (n - 1).

The magnetic angular momentum quantum number m{eq}_{l} {/eq} can have the values between -l and +l.

The magnetic spin quantum number can have the values -1/2 or +1/2.