SELECT * FROM question_mgmt as q WHERE id=4002 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=8 AND subId=16 AND chapterId=183 and ex_no='3' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 9th science Structure of the Atom helium atom has an atomic mass of 4 u and two prot

Question:

Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?

Answer:

Atomic mass of Helium = 4u
Atomic mass of an atom = no. of protons + no. of neutrons
4 = 2 + no. of neutrons
no. of neutrons = 4 - 2 = 2
Helium has 2 neutrons.


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