SELECT * FROM question_mgmt as q WHERE id=1253 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=43 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

How many neutrons and protons are there in the following nuclei?

Answer:

We know atomic number(z) = no of protons = no of electrons

Also mass number(A) = no of protons + no of neutrons

136C:

Here mass number = 13

Atomic number = Number of protons = 6

Number of neutrons = (mass number) – (Atomic number)

= 13 – 6 = 7

 

:

Here mass number = 16

Atomic number = 8 Number of protons = 8 Number of neutrons = (mass number) – (Atomic number)

= 16 – 8 = 8

 

:

Here Mass number = 24

Atomic number = Number of protons = 12

Number of neutrons = (mass number) – (Atomic number)

= 24 – 12 = 12

 

:

Here mass number = 56

Atomic number = Number of protons = 26

Number of neutrons = (mass number ) – (Atomic number)

= 56 – 26 = 30

 

:

Here mass number = 88

Atomic number = Number of protons = 38

Number of neutrons = (mass number) – (Atomic number)

= 88 – 38 = 50


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