Screenshot of the atom colour settings I use for my molecules in Discovery Studio Visualizer (found under Chemistry → Element Properties...). A copiable colour code is found in the description of this file, which you can paste into your own file descriptions.

Colour code:

  Hydrogen, H: white

  Helium, He: cyan

  Lithium, Li: lilac

  Beryllium, Be: yellow-green

  Boron, B: pink

  Carbon, C: black

  Nitrogen, N: blue

  Oxygen, O: red

  Fluorine, F: yellow-green

  Neon, Ne: cyan

  Sodium, Na: lilac

  Magnesium, Mg: green

  Aluminium, Al: pink-brown

  Silicon Si: blue-grey

  Phosphorus, P: orange

  Sulfur, S: yellow

  Chlorine, Cl: green

  Argon, Ar: sky blue

  Potassium, K: purple

  Calcium, Ca: green

  Scandium, Sc: grey

  Titanium, Ti: grey

  Vanadium, V: grey

  Chromium, Cr: grey-blue

  Manganese, Mn: grey-purple

  Iron, Fe: grey-purple

  Cobalt, Co: grey-blue

  Nickel, Ni: grey-blue

  Copper, Cu: pink-orange

  Zinc, Zn: blue-grey

  Gallium, Ga: pink-brown

  Germanium, Ge: blue-grey

  Arsenic, As: lilac

  Selenium, Se: yellow-brown

  Bromine, Br: red-brown

  Krypton, Kr: teal

  Rubidium, Rb: purple

  Strontium, Sr: green

  Yttrium, Y: cyan

  Zirconium, Zr: light blue

  Niobium, Nb: light blue

  Molybdenum, Mo: teal

  Technetium, Tc: teal

  Ruthenium, Ru: teal

  Rhodium, Rh: teal

  Palladium, Pd: dark teal

  Silver, Ag: silvery blue

  Cadmium, Cd: peach

  Indium, In: brown

  Tin, Sn: blue-grey

  Antimony, Sb: lilac

  Tellurium, Te: brown

  Iodine, I: purple

  Xenon, Xe: teal

  Caesium, Cs: purple

  Barium, Ba: green

  Lanthanum, La: light blue

  Cerium, Ce: cream

  Praseodymium, Pr: light green

  Neodymium, Nd: light green

  Promethium, Pm: light green

  Samarium, Sm: light green

  Europium, Eu: aqua

  Gadolinium, Gd: aqua

  Terbium, Tb: aqua

  Dysprosium, Dy: aqua

  Holmium, Ho: aqua

  Erbium, Er: green

  Thulium, Tm: green

  Ytterbium, Yb: green

  Lutetium, Lu: green

  Hafnium, Hf: blue

  Tantalum, Ta: blue

  Tungsten, W: blue

  Rhenium, Re: blue

  Osmium, Os: dark blue

  Iridium, Ir: dark blue

  Platinum, Pt: dark blue

  Gold, Au: gold

  Mercury, Hg: grey

  Thallium, Tl: brown

  Lead, Pb: blue-grey

  Bismuth, Bi: purple

  Polonium, Po: brown

  Astatine, At: dark brown

  Radon, Rn: teal

  Francium, Fr: dark purple

  Radium, Ra: dark green

  Actinium, Ac: blue

  Thorium, Th: blue

  Protactinium, Pa: blue

  Uranium, U: blue

  Neptunium, Np: blue

  Plutonium, Pu: blue

  Americium, Am: violet

  Curium, Cm: violet

  Berkelium, Bk: purple

  Californium, Cf: purple

  Einsteinium, Es: purple

  Fermium, Fm: pinkish purple

  Mendelevium, Md: pinkish purple

  Nobelium, No: pink

  Lawrencium, Lr: pink