Periodic table (metals): Which is the lightest metal by atomic mass? Focus on stable metallic elements at standard conditions. Choose the correct metal.
General Knowledge
General Science
Difficulty: Easy
Choose an option
Answer
Correct Answer: Lithium
Explanation
Given data
- Ask: Lightest (lowest atomic mass) metal.
Concept/Approach Among metals, lithium (Li) is the lightest (atomic number 3; relative atomic mass ≈ 6.94). It is an alkali metal with very low density as well.
Comparison • Sodium (Na) and potassium (K) are heavier than lithium. • Magnesium (Mg) and aluminium (Al) are also heavier.
Final Answer Lithium