The mass of an electron is:
- A1.6727 × 10-27kg
- B1.6750 × 10-27kg
- C9.1095 × 10-31kg
- D1.6022 × 10-19kg
In an electric field, a neutron:
- ADeflects towards the positive pole
- BDeflects towards the negative pole
- CRemains undeflected
- DDeflects towards both poles
An anion is formed when an atom:
- ALoses electrons
- BGains electrons
- CLoses protons
- DGains neutrons
Across a period from left to right, the atomic radius:
- AIncreases
- BDecreases
- CRemains constant
- DFirst increases then decreases
The principal quantum number (n) determines:
- AShape of the orbital
- BOrientation of the orbital
- CEnergy and size of the shell
- DSpin of the electron
For an azimuthal quantum number l = 2, the orbital is:
The magnetic quantum number (m) describes:
- AThe energy of the electron
- BThe shape of the orbital
- CThe orientation of the orbital in space
- DThe spin of the electron
According to Pauli's exclusion principle:
- AElectrons occupy degenerate orbitals singly first
- BNo two electrons in an atom can have the same set of all four quantum numbers
- CElectrons fill lowest energy orbitals first
- DHalf-filled orbitals are more stable
According to the n+l rule, which orbital has higher energy?
- A4s (n+l = 4)
- B3d (n+l = 5)
- C3p (n+l = 4)
- D3s (n+l = 3)
Down a group from top to bottom, the ionization energy:
- AIncreases
- BDecreases
- CRemains constant
- DFirst increases then decreases
