Predicting Element Properties Laboratory

Guided predictionLive observation

Select a periodic-table position to predict the element’s properties.

PositionPeriod 3 · Group 1

Atomic radius190 pm

First ionization5.14 eV

Electronegativity0.93

Element Property PredictorPaused

ModeStudent

Position becomes a prediction

Period and group reveal electron structure. Trend directions then suggest size, attraction, bonding, and metallic behavior.

Period estimates occupied shells.
Main-group position predicts valence electrons.
Nearby measured elements test the trend.

Table scanner

Sound

Selected element

Property lens

Hide identity challenge

Simulation speed1×

Prediction evidence

Period3

Group1

Valence electrons1

Room stateSolid

View and focus

Trend graph

Teacher demonstrations

Guided visual lecture

Chapter 1 of 80%

Ready. Narration uses embedded, recordable tab audio.

Language

Narrator

Playback speed1×

External recording: share this browser tab with tab audio enabled. No microphone is used.

1. Reading position

Watch: The scanner links a tile to period and group.

Chapters

Position rules

Occupied main shells ≈ period number

Main-group valence electrons: groups 1–2 use the group number; groups 13–18 use group minus 10. Helium is an exception.

Radius: generally increases downward and leftward.

Ionization energy and electronegativity: generally increase upward and rightward.

Learning objectives

Read period and group from position.
Predict shells and main-group valence electrons.
Apply the major periodic-trend directions.
Use measured data to identify exceptions.

Suggested investigations

Sweep across period 2 using each property lens.
Compare lithium, sodium, potassium, rubidium, and caesium.
Use Mystery mode before revealing evidence.
Compare nitrogen with oxygen to find an ionization exception.

Questions for exploration

Why do elements in one group often behave similarly?
Which trends point in opposite directions?
Why must exact values be measured?

Teacher whiteboard

Use finger, stylus, mouse, Android device, or smart board. Each page keeps its own drawing.

Pen color

Line width4

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Knowledge check

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