#1
What is the charge of a proton?
Positive
Negative
Neutral
Variable
#2
Who proposed the plum pudding model of the atom?
Ernest Rutherford
J.J. Thomson
Niels Bohr
John Dalton
#3
What is the mass of an electron?
Approximately 1 amu
Approximately 1/1836 amu
Approximately 1 gram
Approximately 1 kilogram
#4
Which subatomic particle has a negligible mass?
Proton
Neutron
Electron
Positron
#5
What is the shape of an s orbital?
Spherical
Dumbbell-shaped
Figure-eight
Pyramidal
#6
What is the number of electrons in a neutral hydrogen atom?
#7
What is the maximum number of electrons in the third shell of an atom?
#8
What is the Bohr radius?
The distance between the nucleus and the outermost electron
The average distance between the nucleus and the electron in the first shell
The radius of the nucleus
The distance between two electrons in the same shell
#9
Which scientist proposed the wave-particle duality of electrons?
Albert Einstein
Louis de Broglie
Max Planck
Werner Heisenberg
#10
What is the maximum number of electrons that can occupy the p subshell?
#11
What is the quantum number that describes the shape of an atomic orbital?
Principal quantum number (n)
Angular momentum quantum number (l)
Magnetic quantum number (m)
Spin quantum number (s)
#12
What is the term for an atom that has gained or lost electrons?
Ion
Isotope
Neutron
Molecule
#13
What is the principle behind the Pauli exclusion principle?
Two electrons in the same orbital must have opposite spins.
Electrons arrange themselves in the lowest energy level.
Electrons orbit the nucleus in defined paths.
Electrons repel each other due to their negative charges.
#14
What is the shape of a d orbital?
Spherical
Dumbbell-shaped
Figure-eight
Pyramidal
#15
What is the term for the energy required to remove an electron from an atom?
Ionization energy
Electron affinity
Binding energy
Excitation energy