The compound Fe(NO2)2 is Iron (II) Nitrite.
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For #4 is 298.48 hope it is correct
If we apply oil that will give us relief without oil we feel head ache because of stress so schools don't allow dry hair
Answer: A) True
Explanation: The difference in energy levels in an atom is responsible for the emission of photons. Emitted photons have different energies because energy levels are discrete. The energy of a photon gives information about its frequency and subsequently, its colour.
As the two gases (Hydrogen & Helium) are distinctively different gases with different discrete energy levels in their atoms, it is logical that the frequency and colour of the emitted photons from their respective atoms would be different.
