4. Consider an atom traveling at 2% of the speed of light. The de Broglie wavelength is found to be 3.50 × 10–6 nm. Which element is this? (Planck’s constant, h = 6.626 × 10-34 J⋅s)
(A) O (16.00)
(B) F (19.00)
(C) S (32.06)
(D) Ar (39.95)

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