Tag: particle nature, basic units

Questions Related to particle nature, basic units

According to Dalton's atomic theory, the smallest particle in which matter can exist is called :

chemistry particle nature, basic units history of atomic model atomic theory of dalton daltons atomic theory

  1. an atom.

  2. an ion.

  3. an electron.

  4. a molecule.

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Correct Option: A
Explanation:

DALTON'S ATOMIC THEORY :

1. Matter is made up of very small undivisible particle called atoms.

2. All the atoms of a given element is identical in all respect i.e. mass, shape, size, etc.

3. Atoms cannot be created nor destroyed by any chemical process.

4. Atoms of different elements are different in nature.

The atom is indivisible was proposed by :

chemistry particle nature, basic units history of atomic model atomic theory of dalton daltons atomic theory

  1. Rutherford

  2. Dalton

  3. Bohr

  4. Einstein

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Correct Option: B
Explanation:

John Dalton considered that " all matter is composed of small particle called the atom."
According to Dalton: 
-Atom is the smallest indivisible part of matter which takes part in the chemical reaction.
-Atom is neither created nor be destroyed.

The valence electrons of an element are responsible for :

chemistry particle nature, basic units history of atomic model atomic theory of dalton daltons atomic theory

  1. physical properties of an element

  2. chemical properties of an element

  3. Both A and B

  4. None of the above

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Correct Option: B
Explanation:

Valence electrons are electrons in the outermost shell and they are responsible for determining the number of bond formation and an atoms charge.This give the atom its chemical properties.

The atomic theory of matter was proposed by :

chemistry particle nature, basic units history of atomic model atomic theory of dalton daltons atomic theory

  1. John Kennedy

  2. Lavoisier

  3. Proust

  4. John Dalton

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Correct Option: D
Explanation:

The atomic theory of matter was proposed by John Dalton.

John Dalton (1766-1844) developed the first useful atomic theory of matter.

Dalton viewed chemical change as :

chemistry particle nature, basic units history of atomic model atomic theory of dalton daltons atomic theory

  1. a transfer of electrons

  2. a transfer of protons

  3. a rearrangement of atoms

  4. a change of atoms from one type into another

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Correct Option: C
Explanation:

Dalton Atomic theory postulates-

1.  All matter is made up of atoms
2. All atoms of a given element are identical in mass and properties
3. Compounds are formed by combining two or more different kind of atoms.
4. A chemical reaction is a rearrangement of atoms.