Electron Configuration
Periodic Table Concepts
Concept Questions
Trends
Electron Configuration
100

Which one will electrons fill first: 2s or 2p?

2s

100

What group number are the halogens?

Group 7A

100

Define Hund's Rule

Every orbital in a sublevel is singly occupied before any orbital is doubly occupied. 

100

Determine where each of the trends increases:

Ionization Energies:

Electron Affinity:

Atomic Size of Neutral Atoms:

Ionization Energies: Increase to right and up

Electron Affinity: Increases to right and up

Atomic Size of Neutral Atoms: Increases to left and down

100
Which orbital is lower in energy: 4s or 3d?

4s

200

Determine the electron configuration for Beryllium

1s22s2

200

Lithium, Sodium, and Potassium all lie in which column?

Alkaline metals

200

What principle is violated in this: 

Electron #1: n=2, l=1, ml=0, ms=1/2

Electron #2: n=2, l=1, ml=0, ms=1/2

Pauli Exclusion Principle

200

Determine which is more metallic in each pair:

1. Sodium or Potassium

2. Oxygen or Chlorine

3. Zinc or Copper

1. Potassium

2. Oxygen

3. Copper

200

Determine the electron configuration for Nitrogen. Include also the condensed version. 

1s22s22p3


[He] 2s2 2p3

300

The following electron configuration belongs to which element: 1s2 2s2 2p6 3s1

Sodium

300

Beryllium, Magnesium, and Calcium all lie in which column?

Alkaline earth metals

300

Determine the effective nuclear charge of the valence electrons in an carbon atom 

+4

300

Organize the groups from largest to smallest atomic radius

1. Kr, Xe, Ne, O

2. H, He, Se, Ca

1. Xe > Kr > O > Ne

2. Ca > Se > He > H

300

The following electron configuration belongs to which element: 1s2 2s2 2p4 

Oxygen

400

Determine the electron configuration for sulfur. Include also the condensed version. 

1s2 2s2 2p6 3s2 3p4


[Ne] 3s2 3p4

400

What period are the elements Copper, Nickel, and Krypton in?

Period 4

400

Which type of ion has a larger radius compared to its neutral version?

Anion

400

Sodium loses an electron. Is it larger or smaller compared to its neutral version? Is the ion version larger or smaller compared to Se2-

A. Smaller

B. Smaller

400

Determine the electron configuration for Gallium

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1

500

What is the electron configuration for I-? Include also the condensed version. 

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

[Xe]

500

Which is more reactive: Iodine or Fluorine?

Iodine

500

When an atom has a more negative energy change, the atom is more likely to more ?

An anion

500

Arrange the following in decreasing order based on ionization energy periodic trend

1. S, K, F, Mg, Ba

2. Si, Pb, O, Hg, Tl

1. F < S < Mg < K < Ba

2. O < Si < Tl < Pb < Hg 

500

What is the condensed electron configuration of Zn+2?

[Ar] 3d10

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