Question

niels bohr
● who/when?
● what did he discover or purpose.
● why is it important?

Explanation:

Niels Bohr (1885 - 1962) was a Danish physicist. He developed the Bohr model of the atom, which proposed that electrons orbit the nucleus in discrete energy - levels. This was important as it was a key step in the development of quantum mechanics, explaining atomic spectral lines and the stability of atoms.

Answer:

Who/When: Niels Bohr was a Danish physicist born in 1885 and died in 1962.
What did he discover or purpose: He developed the Bohr model of the atom, suggesting electrons orbit the nucleus in fixed energy - levels.
Why is it important: It was crucial for the development of quantum mechanics, explaining atomic spectral lines and atomic stability.