Model Of The Atom Flashcards
(26 cards)
What is the basic unit of matter?
Atom
True or False: Atoms can be divided into smaller particles.
True
Who proposed the first atomic theory in the early 19th century?
John Dalton
Fill in the blank: The nucleus of an atom contains ______ and ______.
protons; neutrons
What charge do protons have?
Positive charge
What charge do electrons have?
Negative charge
Which model of the atom is also known as the ‘plum pudding model’?
J.J. Thomson’s model
True or False: The Rutherford model introduced the concept of a nucleus.
True
In which model do electrons orbit the nucleus in defined paths?
Bohr model
What principle states that it is impossible to know both the position and momentum of an electron simultaneously?
Heisenberg Uncertainty Principle
What is the primary focus of the quantum mechanical model of the atom?
Probability distribution of electrons
Who is associated with the development of the quantum mechanical model?
Erwin Schrödinger
Fill in the blank: The maximum number of electrons in a shell is given by the formula ______.
2n²
What is an isotope?
Atoms of the same element with different numbers of neutrons
True or False: All atoms of an element have the same number of protons.
True
What is the term for the weighted average of the masses of an element’s isotopes?
Atomic mass
Which model of the atom was developed using the Gold Foil Experiment?
Rutherford model
What is the electron configuration of a carbon atom?
1s² 2s² 2p²
True or False: Electrons occupy energy levels closest to the nucleus first.
True
What is the name of the principle that governs the filling of atomic orbitals?
Aufbau principle
What shape does an s orbital have?
Spherical
Fill in the blank: The ______ model describes electrons as wave functions.
quantum mechanical
What does the term ‘valence electrons’ refer to?
Electrons in the outermost shell
Which atomic model suggests that electrons exist in fixed orbits?
Bohr model
