When a Lithium Atom Is Made from a Helium Atom

question 23

Multiple Choice

When a lithium atom is made from a helium atom by adding a proton (and neutron) to the nucleus and an electron outside, the electron goes into an n = 2, ℓ=0 state rather than an n = 1, ℓ=0 state.This is an indication that electrons:

• A)obey the Pauli exclusion principle
• B)obey the minimum energy principle
• C)undergo the Zeeman effect
• D)are diffracted
• E)and protons are interchangeable