Dalton's Atomic Theory

Q.

State the drawbacks of thomsons atomic model

Q.

Mention briefly the salient features of Dalton's atomic theory (five points).

Q. Which of the following is not a part of Dalton's atomic theory?

1. All matter is composed of indivisible atoms.
2. The properties of atoms of the same element can be different.
3. Compounds form when atoms combine in whole number ratios.
4. An atom can neither be created nor destroyed.

Q.

Fill in the blanks :

(a) Dalton said that _______________ could not be divided.

(b) An ion which has a positive charge is called a _______________

(c) The outermost shell of an atom is known as _______________

(d) The _______________ of an atom is very hard and dense.

(e) Neutrons are __________________ particles having mass equal to that of portons.

(f) Isotopes are the atoms of __________________element having the __________________atomic number but __________________mass number.

Q.

Which of the following statements is incorrect?

1. One mole of oxygen gas contains avogadro’s number of atoms

2. One gram atom of carbon contains avogadro’s number of atoms

3. One mole of hydrogen contains avogadro’s number of atoms

4. Mole=Mass/Molecular Mass

Q.

Write 'true' or 'false' for the following statements :

(a) An atom on the whole has a positive charge.

(b) The maximum number of electrons in the first shell can be 8.

(c) The central part of an atom is called nucleus.

Q.

Which Greek thinker named parmanu as atom?

1. William Crooks

2. Democritus.

3. Maharshi Kannada

4. John Dalton

Q. Discuss the similarities and difference between elements and compounds.

Q.

Democritus is best known for being the first person to propose that atoms exist.

1. True

2. False

Q. According to Dalton's atomic theory, atoms:

1. cannot be created
2. cannot be destroyed
3. are divisible
4. are indestructible

Q.

Calculate the number of atoms in one atom of Sodium, Na.

1. 1

2. 11

3. 23

4. $6.022\times {10}^{23}$

Q. ________ proposed that an atom can neither be created nor be destroyed.

1. J. J. Thomson
2. Neils Bohr
3. John Dalton
4. Ernest Rutherford

Q. What is Quantum theory

Q. Which one of the following is the true with respect to Avogadro's number?

1. It gives the number of particles in 1 mole of the substance
2. It is represented as N
3. The value of Avogadro's number is $6.023\times {10}^{23}$
4. The value of Avogadro's number remains constant

Q.

Who discovered atomic mass?

Q.

a brief history of atomic structure(Bohr's)

Q.

According to Dalton, Atoms combine in _______ ratio to form compounds

Q.

Like atoms are identical in all respects. This statement of Daltons atomic theory is contradicted. Which discovery contradicts this?

Q.

Who invented quantum theory?

Q.

What is the difference between Quantum Mechanical Model of an atom and Bohr's atomic Model?

Q.

An _________ is the smallest particle of an element that takes part in a chemical reaction.

Q. Identify the name of the scientist who proposed the Earliest model of an atom.

1. John Dalton
2. Niels Bohr
3. J.J. Thomson
4. Rutherford

Q.

Identify the postulates of Daltons atomic theory which are no longer accepted by the modern knowledge of nature of matter.

Q.

What are atoms ? How big are atoms ? How do atoms Occur ?

Q. Which of the following was not proposed by Thomson in his model?

1. None of these.
2. The mass of an atom is uniformly distributed over the atom.
3. Electrons revolve around the nucleus.
4. An atom is electrically neutral.

Q.

The positive charge of the nucleus is due to the presence of neutrons present in it.

1. True
2. False

Q.

Write 'true' or 'false' for the following statements :

(a) An atom on the whole has a positive charge.

(b) The maximum number of electrons in the first shell can be 8.

(c) The central part of an atom is called nucleus.

Q. Give one major drawback of Dalton's atomic theory of matter.

Q.

Which theory has provided an explanation for the law of conservation of mass and the law of definite proportions?

1. Lavoisier's theory

2. Democritus atomic theory

3. Dalton's atomic theory

4. J.J Thomson's atomic theory

Q. cannot be broken down into simpler components using any physical or chemical process.

1. Elements
2. Compounds
3. Mixtures