## Glossary of assignment 2 ch 4

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- how many quantum numbers are used to describe the energy state of an electron in an atom
- 4

- a spherical electron cloud surroudning an atomic nucleus would best repersent
- an s orbital

- an energy level of n=4 can hold _______- electrons
- 32

- en energy level of n=2 can hold _____ electrons
- 8

- an electron for which n=4 has more ___ than an electron for which n=2
- energy

- the modern model of the atom that treates electrons as waves
- quantum mechanical model of the atom

- states that it is impossible to know both the velocity and the position of a particle at the same time
- Heisenbery uncertainty principle

- a three dimensinal region around the nucleus representnig the probabiliyy of finding an electron
- atomic orbital

- originally applied ot the hydrogen atom, it led to the quantum mechanical model of the atom
- Schrodinger wave equation

- atomic orbitals ________ have an exactly defined size
- do not

- each orbital may contain at most _____ electrons
- two

- all s orbitals are _____
- spherically shaped

- a principal enenrgy has __ energy sublevels
- n

- the maximum number of _ related to each principal energy level equals 2n2
- electrons

- there are __ equal energy p orbital
- three

- hydroven's principal energy level 2 consists of __ orbitals
- 2s and 2p

- hydroven's principal energy level 3 consists of _____ orbitals
- nine

- the bending of a wave as it passes by t he edge of an object is called
- diffraction

- when waves overpal each other ____ occurs
- interferance

- the wave properties of electrons and other very small particles are described mathematically by
- quantum theory

- an orbtal, a three dimensiaonal region aroundt he nucleus indicates
- the probable location of an electron

- wave functions give only the probability of finding an electron at a given place around the nucleus
- true

- what are quantum numbers
- numbers that specify the properties of atomic orbitals and the properties of electrons in orbits

- principal quantum #
- n, main enrgy levels surrounding nucleus

- angular momentum number
- l, shape of an orbital

- magnetic quantum number
- m, orientation of an orbital about teh nucleus

- what does the spin number indicate
- +1/2, -1/2 the two possible states of an electron orbital