Question

Which of the following has negative charge and pairs with opposite spin?

• A. Proton
• B. Neutron
• C. Electron
• D. Isotope
• E. Ion

Answer 1

Answer: (C)

Electron

Electron has negative charge.
it is impossible for two electrons of a poly-electron atom to have the same values of the four quantum numbers: n, the principal quantum number,$l$, the angular momentum quantum number, $m_l$, the magnetic quantum number, and $m_s$, the spin quantum number. For example, if two electrons reside in the same orbital, and if their $n$, $l$, , and $m_l$ values are the same, then their ms must be different, and thus the electrons must have opposite half-integer spins of $+\frac{1}{2}$ and $-\frac{1}{2}$.