TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: When the phosphorus element - whose name means "light bringing" - was first isolated, scientists noted that it glowed in the dark and burned when exposed to air

SOLUTION: When what element - whose name means "light bringing" - was first isolated, scientists noted that it glowed in the dark and burned when exposed to air?

PROBLEM: Bones are made up of different types of tissue.

SOLUTION: Bones are made up of different types of what?

PROBLEM: The mass of atoms is based on the number of protons and neutrons in nucleus.

SOLUTION:
The mass of atoms is based on the number of protons and neutrons in what?