Chapter 4-5 Flashcards
Atomic radii
Size AR As you go down a group increases Across a period decreases Cations are smaller than original atom Anions are bigger
Ionization energy
IE
Energy required to take away an election
Down a group ie decreases
A cross a period ie increases
Electron affinity
Amount of energy required to add an electron
Electronegativity
Amount of attraction an atom has for an electron in a chemical bond Increase across a period Decrease down a group F has highest en value Closer to f greater the en value
Dobriener
Grouped elements in for ups of 3
Called the triads
Famous triad: cl br I
Newlands
Grouped elements in groups of 8
Called this rule “law of octaves”
Scientists grouped based on how they reacted
Dmirri Mendeleev
Discovered periodic table
Placed elements in groups by si solar properties
Henry Moseley
Discovered periodic law
Periodic law
The physical and chemical properties of the elements are periodic functions of their atomic numbers
S orbitals
Holds 2 electrons
P orbitals
6 electrons
D orbital
10 electrons
F orbital
14 electrons
Electromagnetic radiation
A form of energy that’s exhibits wave like behavior as it travels through space
Electromagnetic spectrum
All the forms of electromagnetic spectrum
Visible light
400-700
Wavelength h ( upside down y )
Distance between corresponding pts on adjacent waves
1 meter =
10^9 nanometers
Frequency ( v )
Number of waves that pass a given point in a given amount of time
Hertz
Photlectric effect
The emission of electrons from a metal when a light source shines on the metal
A certain violet light has a wavelength of …… What is its energy?
6.626x10^-34(2.998x10^8)/ wavelength
Determine the energy of light with a frequency
6.626x10^-34( frequency )
Determine the frequency of light with a wavelength of…..
2.998x10^8/ wavelength
4 types of periodic properties
Atomic radius
Ionization energy
Electron affinity
Electro negativity
