Review Unit 4: Electrons

Bohr Model

100

Draw the Bohr diagram of Lithium. 

K: 2 e

L: 1 e

200

Draw the Bohr diagram of Fluorine. 

K: 2 e

L: 8 e

M: 1 e

300

Draw the Bohr model of Argon. 

K: 2 e

L: 8 e

M: 8 e

400

Draw the Bohr model of Bromine. 

K: 2 e

L: 8 e

M: 18 e

N: 7 e

500

Draw the Bohr diagram of an element with an atomic weight of 31. 

K: 2 e

L: 8 e

M: 5 e

Dot Diagram

100

Draw the dot diagram of hydrogen.

H .

200

Draw the dot diagram of oxygen. 

  ..

: O :

300

Draw the dot diagram of strontium. 

. Sr .

400

Draw the dot diagram of astatine. 

    ..

:  At  :

    .

500

What do the dots in a dot diagram represent?

The valence electrons of an atom.

Electron Config

100

What is the EC of Helium?

1s²

200

What is the EC of Sulfur?

1s²2s²2p⁶3s²3p⁴

or

[Ne] 3s²3p4

300

What is the EC diagram of Silver?

[Kr] UD  UD UD UD UD U_

        5s             4d⁹

400

What is the EC diagram of Cerium? 

[Xe] UD U_ __ __ __ __ __ __

        6s                4f

500

What is the complete EC of Plutonium? (NO ABBREVIATION!!!) 

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹⁴5d¹⁰6p⁶7s²5f⁵

Ions

100

What is the total # of electrons of Cl^-?

e = 18 

200

What is total # of protons in K⁺?

p = 19

300

What is the EC diagram of Fe⁺³? 

[Ar] UD U_ U_ U_ __ __

       4s              3d         

400

What is the element and its overall charge if there are 13 protons and 14 electrons? 

+13 + -14 = 1-

Answer: Al^-

500

Explain the difference in electron configurations between a neutral atom and its ion.

The ion has a different number of electrons compared to the neutral atom, affecting its electron configuration.

XTRA

100

How many electrons fit in a the first, second, and third shell?

1st: 2 e

2nd: 8 e 

3rd: 18 e 

200

What are cations and anions? 

Cations: positively charged ions that reduce the amount of electrons

Anions: negatively charged ions that increase the amount of electrons

300

What is the main feature of the Bohr model of the atom?

It depicts electrons traveling in fixed orbits around the nucleus.

400

What does the Pauli exclusion principle tell us? 

No two electrons can have the same set of quantum numbers. 

Correct: UD 

Incorrect: UU or DD

500

Explain the significance of dot diagrams in understanding chemical bonding.

Dot diagrams help visualize how atoms share or transfer valence electrons to form bonds.