Question

1. scientists are consistently building on each others models. what did bohr add to the model of the atom?

history of the atom timeline
democritus - 460 bce
john dalton - 1803 ad
j.j. thomson - 1897
ernest rutherford - 1912
niels bohr - 1913
options:
that there is an electron cloud around a nucleus.
that atoms have protons and electrons stuck together.
that atoms have orbiting electrons that can jump energy levels.
that atoms are solid structures and simple building blocks.
clear all

Explanation:

To determine what Bohr added to the atomic model, we analyze each option:

• The electron cloud model is from quantum mechanics (not Bohr).
• The "protons and electrons stuck together" idea is incorrect (Dalton's model was more about indivisible atoms, and Thomson had the plum - pudding model with electrons in a positive sphere, but not stuck protons and electrons in that way).
• Bohr's model introduced the concept of electrons orbiting the nucleus in specific energy levels and being able to jump between these levels (absorbing or emitting energy).
• The "solid structures and simple building blocks" idea is from early atomic theories like Dalton's, not Bohr's.

Answer:

That atoms have orbiting electrons that can jump energy levels.