Answer :

Atomic mass number is the sum of number of protons (p) and neutrons (n) in the nucleus. It is represented by the symbol ‘A’.

Atomic mass number = Number of protons + Number of neutrons

A = p + n

By the above formula, we can easily calculate the atomic mass number of any element.

Example:-

i. A lithium atom contains 3 protons and 4 neutrons. Its atomic mass number is A = 3 + 4 = 7


ii. In a sodium atom, there are 11 protons and 12 neutrons. Thus, its atomic number is A = 11 + 12 = 23


iii. A magnesium atom contains 12 protons and 12 neutrons. Its atomic mass number is A = 12 + 12 = 24


iv. A hydrogen atom contains 1 proton and 0 neutron. Its atomic mass number is A = 1 + 0 = 1

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Champ Quiz | Cell- Structure and FunctionsChamp Quiz | Cell- Structure and FunctionsChamp Quiz | Cell- Structure and Functions34 mins
Continuation of The SpeciesContinuation of The SpeciesContinuation of The Species43 mins
Quiz | Practice Questions on Endomembrane SytemQuiz | Practice Questions on Endomembrane SytemQuiz | Practice Questions on Endomembrane Sytem37 mins
Champ Quiz | CellChamp Quiz | CellChamp Quiz | Cell44 mins
Quiz | Reason & AssertionQuiz | Reason & AssertionQuiz | Reason & Assertion40 mins
Cell - Number, Size and ShapeCell - Number, Size and ShapeCell - Number, Size and Shape40 mins
Champ Quiz | Let's check your understanding on CellChamp Quiz | Let's check your understanding on CellChamp Quiz | Let's check your understanding on Cell36 mins
Cell Regions and BoundariesCell Regions and BoundariesCell Regions and Boundaries43 mins
NCERT | The Story of LightningNCERT | The Story of LightningNCERT | The Story of Lightning41 mins
Questions of OlympiadQuestions of OlympiadQuestions of Olympiad46 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

<span lang="EN-USMHB - Science (Old)

<span lang="EN-USMHB - Science (Old)

<span lang="EN-USMHB - Science (Old)

<span lang="EN-USMHB - Science (Old)