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2. structure of atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
Select the correct statements from the following

$A$. Atoms of all elements are composed of two fundamental particles.

$B$. The mass of the electron is $9.10939 \times 10^{-31} kg$.

$C$. All the isotopes of a given element show same chemical properties:

$D$. Protons and electrons are collectively known as nucleons.

$E$. Dalton's atomic theory, regarded the atom as an ultimate particles of matter Choose the correct answer from the options given below

  • ✓
    $B, C$ and $E$ only
  • B
    $A, B$ and $C$ only
  • C
    $C, D$ and $E$ only
  • D
    $A$ and $E$ only
✓

Answer

Correct option: A.
$B, C$ and $E$ only
a
- Atoms consist of three fundamental particles :

Electrons, protons and neutrons

- The mass of the electron is $9.10939 \times 10^{-31}\,kg$

- All the isotopes of a given element show same chemical properties.

- Protons and neutrons present in the nucleus are collectively called as nucleons.

- Dalton's atomic theory, regarded the atom as the ultimate particle of matter

So, the correct statements are $B, C, E$ only

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