Best tricks to remember atomic mass number.

 Best trick to remember atomic weight number in Hindi

 Here is a very good way to remember atomic mass number so that you can remember atomic mass number very easily

 Atomic Mass Number:- The mass number of an atom is the sum total of the number of protons and the number of neutrons.

 Z = p + n

 The atomic mass number is expressed in amu(atomic mass unit) .

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 In this method you must remember the value of atomic number of elements. Here is how to calculate mass number up to 40.  This method fails when the mass number is more than 40.  Generally questions up to mass number 40 are asked in the examinations.  Mass numbers greater than that will have to be crammed or another method is adopted.

 • How to easily remember the mass number of an element?

 To find the mass number of elements, we follow the following method:-

 mass number = 2 × atomic number

 This method can only be used to guess the answer and can be used as a trick to remember the mass number of an element.

 1) Mass number of hydrogen(H)

 Atomic number of hydrogen = 1

 Mass number of hydrogen = 1.008amu

2) Mass number of Helium(He)

 Atomic number of helium = 2

 Mass number of helium = (2 × 2)

 Actual mass number = (4 amu)

3) Mass number of Lithium(Li)

 atom number of lithium = 3

 Mass number of lithium = (2 × 3)

 Actual mass number = 6.94

 4)Mass number of beryllium (Be)

 Atomic number of beryllium = 4

 Mass number of beryllium = (2 × 4)

 Actual mass number = 9.01

 5) Mass number of boron(B)

 Atomic number of Boron = 5

 Mass number of boron = (2×5)

 Actual mass number = 10.8

 6) Mass number of carbon

 Atomic number of carbon = 6

 Mass number of carbon = (2 × 6)

 Actual mass number = 12.0

 7) Mass number of nitrogen

 Atomic number of nitrogen = 7

 Mass number of nitrogen = (2×7)

 Actual mass number = 14.0

 8) Mass number of oxygen

 Atomic number of oxygen = 8

 Mass number of oxygen = ( 2 × 8)

 Actual mass number = 16

 Here, special attention has to be paid to beryllium, potassium and chlorine as all three have mass 1 more than twice the atomic number.  The atomic number of chlorine is 17 while the mass number is 35.  The atomic number of potassium is 19  while its mass number is 39.09 .  Argon has an atomic number of 18  while its mass number is 39.94 , which is about 3 times more than twice the atomic number. We have to pay special attention to these exceptions. (Note: - Only up to 40 mass numbers are being discussed here)

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 MCQ questions related to Atomic Mass Number

 Q1.  Which of the following is the mass number of calcium:-

 A. 20

 B. 30

 C. 40

 D. 44

 Solution:- Atomic number of calcium = 20

 Hence mass number = 2×20

 = 40 ans.

 Q.2.  What is the mass number of Sulfur? :-

 A. 22

 B. 32

 C. 35

 D. 30

 Solution:- Atomic number of sulfur = 16

 Mass number of sulfur = 2×16

 = 32 ans.

Q. What is the mass number of Aluminium?

 A. 30.97

 B. 26.98

 C. 44.95

 D. 24.30

 Ans:- B. 26.98

 Solution:- Atomic number of aluminum = 13

 Mass number of aluminum = 13×2

 = 26(approx)

 Q. Which of the following is the mass number of magnesium:-

 A.  24.30

 B. 39

 C. 14.08

 D. 32.06

 Ans:- A. 24.30

 Solution:- Atomic number of magnesium = 12

 mass number = 2×12

 = 24(approx)