1:   In a chemical reaction, ------participate
Options:
  1. all the electrons
  2. valence electron
  3. protons
  4. electron and proton

Answer: Option 2

Explanation:

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2:   The shells or orbits are denoted by
Options:
  1. K,L,M,N,---------
  2. A,B,C,D,-------
  3. a,b,c,d, -------
  4. none of the above

Answer: Option 1

Explanation:

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3:   The total number of electrons present in the outermost shell of magnesium is
Options:
  1. 4
  2. 2
  3. 3
  4. 1

Answer: Option 2

Explanation:

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4:   Electron revolve around the nucleus in definite circular paths called orbit. This was suggested by
Options:
  1. Thomson
  2. Rutherford
  3. Bohr
  4. Dalton

Answer: Option 3

Explanation:

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5:   Oxygen has ------isotopes.
Options:
  1. 2
  2. 4
  3. 3
  4. 5

Answer: Option 3

Explanation:

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6:   Entire positive charge in an atom is concentrated in a small area at its center called nucleus. This was suggested by
Options:
  1. Thomson
  2. Rutherford
  3. Bohr
  4. Dalton

Answer: Option 2

Explanation:

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7:   Protium, deuterium and tritium are the isotopes of
Options:
  1. oxygen
  2. nitrogen
  3. hydrogen
  4. carbon

Answer: Option 3

Explanation:

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8:   Carbon has three isotopes, whose mass numbers are
Options:
  1. 11,12,13
  2. 12,13,14
  3. 14,15,16
  4. none of these

Answer: Option 2

Explanation:

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9:   Mass of a neutron is equal to
Options:
  1. the mass of an electron
  2. half of mass of an electron
  3. the mass of a proton
  4. half the mass of a proton

Answer: Option 3

Explanation:

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10:   The mass of proton is the same as that of
Options:
  1. carbon atom
  2. an electron
  3. hydrogen ion
  4. oxygen atom

Answer: Option 3

Explanation:

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There was a mood of magic and frenzy to the room. Crystalline swirls of sugar and flour still lingered in the air like kite tails. And then there was the smell-the smell of hope, the kind of smell that brought people home.
-Sarah Addison Allen The Girl Who Chased the Moon