Dilution problem. I tired M1V1 = M2V2 with M1 = 7.428M and V1 = 0.003L and V2 = 0.007L, but it was wrong. Is it supposed to be V2 = 0.01L (3mL + 7mL)?

if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.