(Na2Cr2O7) all the numbers are bellow not over
The answer is B, sodium is an element.
It’s because new discoveries are made all the time sometimes what was considered right may be found out to be wrong
Answer: ok, its C
Explanation: I used D=26.4* 3 to calculat it
The contribution to the nature of light-
Thomas Young - wave nature of light (double-slit experiment)
Max Planck - E = hv
Albert Einstein - a quantum theory of light
Thomas Young proposed the most important double-slit experiment which shows that light acts like a wave and shows the pattern of interferences.
Max Planck proposed that light is proportional to frequency. He gave the equation, E = hv, where E is the energy of light, h is Planck's constant, and v is the frequency.
Albert Einstein proposed the quantum theory of light. He determined that light exists in discrete quanta of energy called photons.
To learn more about the nature of light, visit: brainly.com/question/4423091
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