Atomic structure fyugp

Who proposed the planetary model of the atom?

• • J.J. Thomson

• • Ernest Rutherford

• • Niels Bohr

• • Max Planck

What particle is negatively charged in an atom?

• • Proton

• • Neutron

• • Electron

• • Positron

In which experiment was the electron discovered?

• Gold foil experiment

• Oil drop experiment

• Cathode ray experiment

• X-ray diffraction experiment

What does the principal quantum number (n) represent?

• Shape of the orbital

• Orientation of the orbital

• Spin of the electron

• Size and energy level of the orbital

According to the Bohr model, the angular momentum of an electron in an atom is:

• Continuous

• Quantized as nℏ

• Quantized as n²ℏ

• Zero

What is the maximum number of electrons that can occupy a p-subshell?

• 6

• 8

• 2

• 4

What is the main concept of the Heisenberg Uncertainty Principle?

• Energy levels are quantized

• It is impossible to know both the exact position and momentum of an electron simultaneously

• The shape of orbitals is defined

• Electrons revolve in fixed paths around the nucleus

Which quantum number describes the shape of an orbital?

• Spin quantum number (s)

• Principal quantum number (n)

• Angular momentum quantum number (l)

• Magnetic quantum number (m)

The Pauli Exclusion Principle states that:

• The uncertainty principle limits the measurement of position and velocity

• Electrons fill orbitals from low to high energy

• No two electrons in an atom can have the same set of four quantum numbers

• Electrons occupy degenerate orbitals singly before pairing

The energy of an electron in the nth orbit of a hydrogen atom is proportional to:

• n

• 1/n

• n2

• 1/n2