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CBSE Class 9 Structure of the Atom — practice questions — page 2

Explore 50 free Structure of the Atom questions in CBSE Class 9 Science. Open each question or exercise to read its content, reference answers and available explanation.

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Structure of the Atom questions and exercises with answers

Showing questions 31–50 of 50.

The maximum electrons in a shell is given by which formula?Read the answer and worked solution →The maximum number of electrons in the outermost shell is:Read the answer and worked solution →An atom with eight electrons in its outer shell has a valency of:Read the answer and worked solution →Protons and neutrons together are also called:Read the answer and worked solution →The mass number of an atom is the sum of its protons and:Read the answer and worked solution →The mass number is denoted by which letter?Read the answer and worked solution →The atomic number is denoted by which letter?Read the answer and worked solution →Elements are defined by the number of their:Read the answer and worked solution →For hydrogen the atomic number Z equals:Read the answer and worked solution →Atoms of the same element with different mass numbers are:Read the answer and worked solution →Atoms with the same mass number but different atomic numbers are:Read the answer and worked solution →The mass of carbon is 12 u because it has 6 neutrons and:Read the answer and worked solution →Match each scientist to the discoveryRead the answer and worked solution →Order the gold foil experimentRead the answer and worked solution →Sort each particle by where it sitsRead the answer and worked solution →True or false about the atomRead the answer and worked solution →Fill the gaps on atomic structureRead the answer and worked solution →Isotope or isobar?Read the answer and worked solution →Spot the one that does not fitRead the answer and worked solution →Pick the right answer, quicklyRead the answer and worked solution →

Worked practice questions

The maximum electrons in a shell is given by which formula?

  1. 2n squared
  2. 3n squared
  3. 4n squared
  4. 5n squared
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Correct answer: A. 2n squared

1. Here n is the orbit or energy level number. 2. The K shell therefore holds two. 3. The formula is 2n squared. _Source: syllabus Science, Ch 4 'Structure of the Atom'_

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The maximum number of electrons in the outermost shell is:

  1. Eleven
  2. Eight
  3. Seven
  4. Nine
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Correct answer: B. Eight

1. Inner shells can hold more than this. 2. The outermost shell is capped. 3. It holds a maximum of 8 electrons. _Source: syllabus Science, Ch 4 'Structure of the Atom'_

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An atom with eight electrons in its outer shell has a valency of:

  1. Five
  2. Nine
  3. Zero
  4. Four
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Correct answer: C. Zero

1. Such atoms show little chemical activity. 2. They are the inert elements. 3. Their combining capacity is zero. _Source: syllabus Science, Ch 4 'Structure of the Atom'_

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