Doesn't fit, but ...

There's a K (potassium), but no L or Ma - but once I got thinking about a 5 year old Ma, naturally I was thinking about Lina Medina.

But this train of thought has led me to a little game, that will probably be boring once the novelty wears off. What are little girls made of?

Silver, Neon, and Sulphur: a glowing, glittering, devilish little girl.

Europium, Nickel, and Cerium: An earthy girl of rare mettle.

Aluminum, Iodine, and Cerium: I'm not sure, but somehow I think she would be a perfect mascot for GirlChat.

Lutetium, Carbon and Yttrium: A rare, lively girl.

Protactinium, Uranium, and Lanthanum: Where did all these element names come from?

Phosphorus, Gold, and Lanthanum: That's a much better combination!

Phosphorus, Gold, Lithium and Sodium: Even better, and I know more or less what those elements are. A hot and salty, but mellow girl. High value.

Boron, Silver, Lanthanum and Dysprosium: No, no! this has all gone horribly wrong!