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DSSSB TGT Class9 Atom Structure — practice questions

Explore 2 free Class9 Atom Structure questions in DSSSB TGT Science. Open each question or exercise to read its content, reference answers and available explanation.

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Class9 Atom Structure questions and exercises with answers

Showing questions 1–2 of 2.

Atomic number Z of an atom equals:Read the answer and worked solution →Isotopes of an element have the same:Read the answer and worked solution →

Worked practice questions

Atomic number Z of an atom equals:

  1. Number of neutrons
  2. Number of electrons in shell K
  3. Number of protons
  4. Number of protons + neutrons
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Correct answer: C. Number of protons

Z is the number of protons in the nucleus; it identifies the element. In a neutral atom, Z also equals the number of electrons.

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Isotopes of an element have the same:

  1. Mass number
  2. Number of neutrons
  3. Density
  4. Atomic number
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Correct answer: D. Atomic number

Isotopes share atomic number Z (same element) but differ in mass number A because they have different neutron counts.

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More Science topics

Life ProcessesScienceChemical Reactions and EquationsElectricityCarbon and its CompoundsMetals and Non-metalsAcids, Bases and SaltsAcids Bases Salts