D is incorrect it is not a compound.
B
When frequency increases, as does the energy, but wavelength decreases. It also works vise versa; if wavelength were to increase, its frequency and energy will decrease.
Answer:
2
Explanation:
Pb(NO3)2 + 2NaI 2NaNO3 + PbI2
The atomic mass of Europium is 152 amu
Work:
151(0.4803) = 72.52 amu
153(0.5197) = 79.5 amu
72.5 + 79.5 = 152 amu
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