Home » General Knowledge » General Science

Periodic table (metals): Which is the lightest metal by atomic mass? Focus on stable metallic elements at standard conditions. Choose the correct metal.

Difficulty: Easy

Lithium
Sodium
Magnesium
Aluminium

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

← Previous Question Next Question→

More Questions from General Science

Environmental chemistry (CFCs): In which common household products were chlorofluorocarbons (CFCs) historically used? Consider domestic applications before bans/restrictions due to ozone depletion concerns. Choose the correct application set.
Diving physiology: Which inert gas replaces nitrogen in the breathing mix for deep-sea divers? Focus on avoiding nitrogen narcosis and improving gas properties at depth. Choose the correct gas.
Climate change (atmospheric gases): Which of the following is not considered a greenhouse gas? Identify the gas that does not significantly absorb outgoing infrared radiation of Earth's surface. Choose the correct option.
Applied gases (welding): Which gases are commonly used in welding processes? Consider both fuel and oxidizer (or shielding) for common welding types. Choose the correct combination.
Fossil fuels (coal types): Identify the variety of coal whose deposits still show recognizable remains of the original plant material. Focus on the least mature stage of coal formation. Choose the correct variety.
Materials science (SiC): In which application is silicon carbide (SiC) commonly used? Consider its hardness, thermal stability, and electrical properties. Choose the correct application.
Solutions (solubility): Which of the following substances is the most soluble in water at room temperature? Compare typical solubilities of common salts. Choose the correct substance.
Solar spectroscopy (history of discovery): Which element was first discovered in the Sun’s chromosphere before being found on Earth? Identify the element detected during the 1868 total solar eclipse via a new spectral line. Choose the correct element.
Everyday chemistry: Soda water contains which dissolved gas under pressure? Focus on the fizzy constituent responsible for effervescence and tangy taste. Choose the correct gas.
Atomic structure (hydrogen): Which of the following is NOT an isotope of hydrogen? Recall the three isotopes of hydrogen and identify the odd one out. Choose the correct option.

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion