pretty sure it's both are physical changes.
1st one is E
2nd one is also E
Frequency = speed of light
---------------------------
wavelength
= 3 x 10^8
------------------------
344 x 10^-9
= 8.72 x 10^14 Hz.
Hope this helps!
Answer: A boron atom has 2 electrons at the first energy level and 3 electrons at the second energy level.
