Ex 2 PDF

# Ex 2 4 - When an atom or ion absorbs energy, its electrons can make transitions from lower energy levels to higher energy levels. 5 - After then returns from higher energy levels to lower energy levels. 6 - The energy is released predominantly in the form of electromagnetic radiation 7 - In a...

# Ex 2 4 - When an atom or ion absorbs energy, its electrons can make transitions from lower energy levels to higher energy levels. 5 - After then returns from higher energy levels to lower energy levels. 6 - The energy is released predominantly in the form of electromagnetic radiation 7 - In a spectrum of an atom, light of only a certain wavelength is emitted or absorbed, rather than a continuous range of wavelengths. Why the light emitted by hydrogen atoms is red because? Because the four characteristic lines and the most intense line in its spectrum is in the red portion at 656 nm. Why we observe a yellow colour in the spectrum of sodium? Because the most intense lines in its spectrum are in the yellow portion of the spectrum at 589 nm. 8 - The light seen from an atom is created from transitions from one energy state to another 9 - The spacing between energy levels in an atom determines the sizes of the transitions that occur. 10 - The hottest portion of a flame is (blue part) | Colour of light absorbed | Approx λ ranges/nm | Colour of light transmitted | |:---|:---|:---| | Red | 700 - 620 | Green | | Orange | 620 - 580 | Blue | | Yellow | 580 - 560 | Violet | | Green | 560 - 490 | Red | | Blue | 490 - 430 | Orange | | Violet | 430 - 380 | Yellow |