Which of the following numbers represent the atomic mass of calcium?

Question

Examoogle · Accepted Answer

The correct answer is Option C: 40 u. The atomic mass of calcium (Ca) is approximately $40	ext{ u}$. Calcium is an alkaline earth metal with atomic number $20$ and mass number $40$.

Step-by-Step Solution & Concepts:
The atomic mass of calcium (Ca) is approximately $40	ext{ u}$. Calcium is an alkaline earth metal with atomic number $20$ and mass number $40$.

Working Principle: The atomic mass of an element is determined by the total number of protons and neutrons in the nucleus of its atom. Calcium has $20$ protons and $20$ neutrons, giving a mass number of $20 + 20 = 40$.

Key Formulas: $	ext{Atomic Mass} = 	ext{Number of Protons} + 	ext{Number of Neutrons}$; $	ext{Atomic Number } (Z) = 20$

Key Points: Calcium is an alkaline earth metal belonging to Group 2 and Period 4 of the periodic table.; The atomic number of calcium is $20$.; The standard atomic mass of calcium is $40.08	ext{ u}$ (commonly taken as $40	ext{ u}$ in numerical problems).

Advantages: Crucial element for bone and teeth formation in biological systems.

Applications: Used in metallurgy as a reducing agent.; Essential nutrient for plant and animal biological functions.

Additional Info: Option A ($32	ext{ u}$) is the atomic mass of Sulfur ($S$).. Option B ($16	ext{ u}$) is the atomic mass of Oxygen ($O$).. Option D ($14	ext{ u}$) is the approximate atomic mass of Nitrogen ($N$).

Answer: C is correct — The atomic mass of calcium is $40	ext{ u}$.

Exam Tip: Remember standard atomic masses of the first 20 elements as they frequently appear in mole concept and stoichiometry numericals in competitive exams.

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