Unit 4: Light, Energy & Electron Configuration

Unit 4 | Chemistry | Mrs. Macurdy

Amplitude

Measure of the height of a wave from the mid-line to the top of a crest or the depth of a trough from the mid-line.

What is the term for number 2?

Trough: lowest point or valley in a wavelength

Light is an…

…electromagnetic wave

Photon

A little packet of energy that can carry electromagnetic radiation

Wavelength

Distance between 2 neighboring crests or 2 neighboring troughs

Frequency

Number of waves that pass a certain point per second

As frequency increases…

…Wavelength decreases/shortens (vice versa)

Hertz (Hz)

Frequency Unit

Ground State

Lowest energy state of an electron in an atom

Excited State

Highest energy state; when an electron absorbs energy

What form of energy results from an electron going to ground state from excited state?

Light (Light energy is released often in the form of a photon)

R.O.Y.G.B.I.V is part of what portion on the EM spectrum?

Visible Light

C=(λ)(v)

Speed of light=Wavelength x Frequency

E=(h)(v)

Energy=Planck’s Constant x Frequency

If only the wavelength is known, what formula do we use to solve for energy? (Yes, energy can be calculated)

E=(h)(v)/λ

Which element has the most EN(electronegativity)?

Fluorine

Ion

Any atom that has a +/- charge

Ionic Radius

Radius of a cation or anion; neutral atoms ionized result in change of size

What unit is ionization energies measured in?

KJ/mol (Kilojoules per mole)

What is the electron configuration for Cr (Chromium)?

1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹

What is the electron configuration for Ag (Silver)?

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 4d¹⁰ 5s¹

What is the electron configuration for Cu (Copper)?

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹

What is the electron configuration for Mo (Molybdenum)?

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁵ 5s¹

What is the noble gas configuration for Se (Selenium)?

[Ar] 3d¹⁰ 4s² 4p⁴

What is the final configuration for P (Phosphorus)?

3p³