Quantum mechanical model of the atom: Part 1

Electrons carry a ______ charge.

• Positive

• Negative

• Neutral

Why did the Bohr model fail?

• as the electrons do not in fact move around the nucleus in circular orbits

• as protons are not found In the nucleus

• as electrons cannot absorb energy and become excited

• because it only worked for metals

Who proposed that electrons are only found in specific, discrete circular orbits around the nucleus like the solar system model?

• Albert Einstein

• Erwin Schrodinger

• Ernest Rutherford

• Niels Bohr

What model of the atom replaced Bohr's model?

• Heisenberg's model

• Thomson's model

• Rutherford's model

• Quantum Mechanical model

What was De Broglie's main finding?

• He discovered atomic orbitals

• He believed protons, just like light particles, could act as waves.

• He believed electrons, just like light particles, could act as waves.

• He could always find the position and speed of an electron

The de Broglie wave equation showed that the wavelength of any moving object is equal to

• m/hν
• h/mv
• v/mh
• hm/v

Regions in which electrons are likely to be found are called?

• atomic orbitals

• principal energy level

• energy sublevel

• spin

The Heisenberg Uncertainty Principle states

• velocity and position cannot be determined at the same time
• a beam of light can interfere with the path and speed of an electron
• photons do not affect the position of an electron
• the velocity of a car cannot accurately be measured by a radar beam