Based on the spectrum observed for incandescent white light, rank the colors in the visible spectrum from highest energy to lowest energy

See below.  

Step-by-step explanation:

An incandescent lamp produces all colours of the visible spectrum, with wavelengths ranging from approximately 400 nm (violet) to 700 nm (red).

Since energy is inversely proportional to wavelength,

E ∝ 1/λ

a quantum of 400 nm violet light has more energy than one of 700 nm red light.

An incandescent lamp produces a relatively small amount of the high-energy blue/violet light ( see image below).

The table below gives the colours in the visible spectrum, ranked from highest to lowest energy.

Colour        λ/nm      

Violet      400 – 450

Blue        450 – 490

Cyan       490 – 520

Green     520 – 560

Yellow    560 – 590

Orange  590 – 635

Red        635 – 700

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.