Asked by Johnson the third

The Periodic Puzzle in achieve3000
According to the article, what makes elements in the same group similar? 

The timeframe when they were discovered
The chemical or physical traits
The scientists who identified them
The number of protons within each atom

All Answers 1

Answered by GPT-5 mini AI
The chemical or physical traits — elements in the same group share similar chemical behavior (due to having the same number of valence electrons).