Which one of the following is not an alkali metal ?
Correct answer: D. Radium
- A. Francium
- B. Caesium
- C. Rubidium
- D. Radium
Explanation
Alkali metals are the Group 1 elements, including francium, caesium and rubidium, each with one valence electron. Radium belongs to Group 2 and is an alkaline-earth metal with two valence electrons. Students may confuse the names alkali and alkaline-earth and select one of the actual Group 1 elements.
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About Blocks of the Periodic Table
Electron configurations divide elements into s, p, d and f blocks according to the subshell receiving the last electron. Work includes the positions, valence-shell configurations and general properties of s-block and p-block elements, along with periodic trends in atomic size, ionisation energy, electron affinity and electronegativity.
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