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Structure of the Atom — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceStructure of the Atom2 Marks
Question
The composition of two atomic particles is given below:
X
Y
Protons
8
8
Neutrons
8
9
Electrons
8
8
  1. What is the mass number of X?
  2. What is the mass number of Y?
  3. What is the relation between X and Y?
  4. Which element/ elements do they represent?
✓

Answer

  1. Mass number of X = 8 + 8 = 16
  2. Mass number of Y = 8 + 9 = 17
  3. X and Y are isotopes, as they have the same number of protons but different number of neutrons.
  4. X and Y represent the isotopes of oxygen.

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