Chapter 9 Flashcards
A model for the atom in which electrons travel around the nucleus in circular orbits at specific fixed distances from the nucleus.
Bohr Model
The foundation of modern chemistry, explains how electrons exist in atoms and how they affect the chemical and physical properties of elements.
quantum-mechanical model
Nobel gases are generally chemically ____.
inert
Alkali metals are generally chemically ____.
reactive
The energy carried per photon is _____ for short -wavelength light than for long-wavelength light.
greater
The shortest (therefore most energetic) wavelength photons are those of _____ rays.
Gamma
When an electron in an atom relaxes (or falls) from a higher energy orbit to a lower energy orbit the atom ____ ____.
Emits Light
A number that indicates the shell that an electron occupies.
Principal Quantum Number
The higher the principal quantum number, the _____ the energy of the orbital.
higher
How many electrons does the 4th shelf hold?
32
How many electrons does the 3rd shelf hold?
18
How many electrons does the 2nd shelf hold?
8
How many electrons does the 1st shelf hold?
2
Number of fixed electrons are within the subshell s?
2
Number of fixed electrons are within the subshell p?
6
