Developing The Model Of The Atom Flashcards
(27 cards)
What is the basic unit of matter?
Atom
True or False: Atoms can be divided into smaller particles.
True
What are the three main subatomic particles?
Protons, Neutrons, Electrons
Fill in the blank: The nucleus of an atom contains ______ and ______.
Protons, Neutrons
What is the charge of a proton?
Positive
What is the charge of an electron?
Negative
What is the charge of a neutron?
Neutral
Which particle determines the atomic number of an element?
Proton
What is the relative mass of a proton?
1 atomic mass unit (amu)
What is the relative mass of an electron?
Approximately 1/1836 amu
Which model of the atom was proposed by John Dalton?
Solid sphere model
What model of the atom did J.J. Thomson propose?
Plum pudding model
True or False: The Rutherford model introduced the idea of a dense nucleus.
True
What did Niels Bohr contribute to the atomic model?
The concept of electron shells
Fill in the blank: Electrons occupy specific ______ around the nucleus.
Energy levels
What is the principle behind the quantum mechanical model of the atom?
The behavior of electrons is described by wave functions.
What does the term ‘isotope’ refer to?
Atoms of the same element with different numbers of neutrons.
Which subatomic particle has the most significant impact on chemical properties?
Electron
What is the maximum number of electrons that can occupy the first energy level?
2
What is the maximum number of electrons that can occupy the second energy level?
8
True or False: The atomic mass is the weighted average of all isotopes of an element.
True
What does the term ‘valence electrons’ refer to?
Electrons in the outermost shell that determine chemical bonding.
Fill in the blank: The ______ model describes electrons in terms of probabilities rather than fixed orbits.
Quantum mechanical
What is the relationship between an atom’s electron configuration and its position on the periodic table?
It determines the element’s chemical properties.
