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Class 9 Chemistry Structure Of Atoms 12. What are the defects of Rutherfords atomic model?


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12. What are the defects of Rutherfords atomic model?

3. The atomic symbol of a phosphorus ion is given as ^{\wedge} \mathrm{P} 3 \sim (c) Draw the electronic configuration of the ion.
3. The atomic symbol of a phosphorus ion is given as  ^{\wedge} \mathrm{P} 3 \sim (c) Draw the electronic configuration of the ion.

3. The atomic symbol of a phosphorus ion is given as ^{\wedge} \mathrm{P} 3 \sim (c) Draw the electronic configuration of the ion.

12. What are the defects of Rutherfords atomic model?
12. What are the defects of Rutherfords atomic model?
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12. What are the defects of Rutherfords atomic model?

1 . What is the nature of charge on cathode rays?
 1 . What is the nature of charge on cathode rays?

1 . What is the nature of charge on cathode rays?

Describe the electronic configuration of \mathrm{Na}^{+} \mathrm{Mg}^{2+} and \mathrm{Al}^{3+} ions. Do they have the same number of electrons in the outermost shell?
Describe the electronic configuration of  \mathrm{Na}^{+} \mathrm{Mg}^{2+}  and  \mathrm{Al}^{3+}  ions. Do they have the same number of electrons in the outermost shell?

Describe the electronic configuration of \mathrm{Na}^{+} \mathrm{Mg}^{2+} and \mathrm{Al}^{3+} ions. Do they have the same number of electrons in the outermost shell?

What do you mean by electronic configuration? What are basic requirements while writing electronic configuration of an element (atom)?
What do you mean by electronic configuration? What are basic requirements while writing electronic configuration of an element (atom)?

What do you mean by electronic configuration? What are basic requirements while writing electronic configuration of an element (atom)?

Example 2.3 An element has 5 electrons in Mshell. Find out its atomic number:
Example  2.3 An element has 5 electrons in Mshell. Find out its atomic number:

Example 2.3 An element has 5 electrons in Mshell. Find out its atomic number:

Give the applications of isotopes in the field of radiotherapy and medicines.
Give the applications of isotopes in the field of radiotherapy and medicines.

Give the applications of isotopes in the field of radiotherapy and medicines.

4. Which one of the following shell consists of three subshells.(a) \mathrm{O} shell(b) N shell(c) L shell(d) M shell
4. Which one of the following shell consists of three subshells.(a)  \mathrm{O}  shell(b) N shell(c) L shell(d) M shell

4. Which one of the following shell consists of three subshells.(a) \mathrm{O} shell(b) N shell(c) L shell(d) M shell

1. Which one of the following results in the discovery of proton(a) cathode rays(b) canal rays(c) X-rays(d) alpha rays.
1. Which one of the following results in the discovery of proton(a) cathode rays(b) canal rays(c) X-rays(d) alpha rays.

1. Which one of the following results in the discovery of proton(a) cathode rays(b) canal rays(c) X-rays(d) alpha rays.

6. Write down the electronic configuration of \mathrm{Al}^{3+} . How many electrons are present in its outermost shell?
6. Write down the electronic configuration of  \mathrm{Al}^{3+} . How many electrons are present in its outermost shell?

6. Write down the electronic configuration of \mathrm{Al}^{3+} . How many electrons are present in its outermost shell?

11 . Give three properties of positive rays.
 11 . Give three properties of positive rays.

11 . Give three properties of positive rays.

5. Which radioisotope is used for the diagnosis of tumor in the body?(a) cobalt-60(b) iodine-131(c) strontium- 90(d) phosphorus-30
5. Which radioisotope is used for the diagnosis of tumor in the body?(a) cobalt-60(b) iodine-131(c) strontium- 90(d) phosphorus-30

5. Which radioisotope is used for the diagnosis of tumor in the body?(a) cobalt-60(b) iodine-131(c) strontium- 90(d) phosphorus-30

7. Magnesium has electronic configuration 282 (a) How many electrons are in the outermost shell?
7. Magnesium has electronic configuration  282 (a) How many electrons are in the outermost shell?

7. Magnesium has electronic configuration 282 (a) How many electrons are in the outermost shell?

3. The atomic symbol of a phosphorus ion is given as ^{\wedge} \mathrm{P} 3 \sim (a) How many protons electrons and neutrons are there in the ion?
3. The atomic symbol of a phosphorus ion is given as  ^{\wedge} \mathrm{P} 3 \sim (a) How many protons electrons and neutrons are there in the ion?

3. The atomic symbol of a phosphorus ion is given as ^{\wedge} \mathrm{P} 3 \sim (a) How many protons electrons and neutrons are there in the ion?

How Rutherford discovered that atom has a nucleus located at the centre of the atom?
How Rutherford discovered that atom has a nucleus located at the centre of the atom?

How Rutherford discovered that atom has a nucleus located at the centre of the atom?

7. The p subshell has:(a) one orbital(b) two orbitals(c) three orbitals (d) four orbitals
7. The p subshell has:(a) one orbital(b) two orbitals(c) three orbitals (d) four orbitals

7. The p subshell has:(a) one orbital(b) two orbitals(c) three orbitals (d) four orbitals

2 . Give five characteristics of cathode rays.
 2 . Give five characteristics of cathode rays.

2 . Give five characteristics of cathode rays.

How was it proved that electrons are fundamental particles of an atom?
How was it proved that electrons are fundamental particles of an atom?

How was it proved that electrons are fundamental particles of an atom?

Example 2.1 Write the electronic configuration of an element having 11 electrons.
Example  2.1 Write the electronic configuration of an element having 11 electrons.
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Example 2.1 Write the electronic configuration of an element having 11 electrons.

4Differentiate between shell and subshell with examples of each.
4Differentiate between shell and subshell with examples of each.
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4Differentiate between shell and subshell with examples of each.

One of the postulates of Bohrs atomic model is that angular momentum of a moving electron is quantized. Explain its meaning and calculate the angular momentum of third orbit (i.e. \mathrm{n}=3 )
One of the postulates of Bohrs atomic model is that angular momentum of a moving electron is quantized. Explain its meaning and calculate the angular momentum of third orbit (i.e.  \mathrm{n}=3  )
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One of the postulates of Bohrs atomic model is that angular momentum of a moving electron is quantized. Explain its meaning and calculate the angular momentum of third orbit (i.e. \mathrm{n}=3 )

3. The concept of orbit was used by(a) J. J. Thomson (b) Rutherford(c) Bohr (d) Planck
3. The concept of orbit was used by(a) J. J. Thomson (b) Rutherford(c) Bohr (d) Planck
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3. The concept of orbit was used by(a) J. J. Thomson (b) Rutherford(c) Bohr (d) Planck

7. Magnesium has electronic configuration 282 (c) Why magnesium tends to lose electrons?
7. Magnesium has electronic configuration  282 (c) Why magnesium tends to lose electrons?
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7. Magnesium has electronic configuration 282 (c) Why magnesium tends to lose electrons?

6. When U-235 breaks up it produces:(a) electrons(b) neutrons(c) protons(d) nothing
6. When U-235 breaks up it produces:(a) electrons(b) neutrons(c) protons(d) nothing
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6. When U-235 breaks up it produces:(a) electrons(b) neutrons(c) protons(d) nothing

8. Deuterium is used to make:(a) light water(b) heavy water(c) soft water (d) hard water
8. Deuterium is used to make:(a) light water(b) heavy water(c) soft water (d) hard water
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8. Deuterium is used to make:(a) light water(b) heavy water(c) soft water (d) hard water

2. Which one of the following is the most penetrating.(a) protons(b) electrons(c) neutrons(d) alpha particles
2. Which one of the following is the most penetrating.(a) protons(b) electrons(c) neutrons(d) alpha particles
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2. Which one of the following is the most penetrating.(a) protons(b) electrons(c) neutrons(d) alpha particles

13. As long as electron remains in an orbit it does not emit or absorb energy. When does it emit or absorb energy?
13. As long as electron remains in an orbit it does not emit or absorb energy. When does it emit or absorb energy?
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13. As long as electron remains in an orbit it does not emit or absorb energy. When does it emit or absorb energy?

Draw a labeled diagram to show the presence of protons in the discharge tube and explain how canal rays were produced.
Draw a labeled diagram to show the presence of protons in the discharge tube and explain how canal rays were produced.
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Draw a labeled diagram to show the presence of protons in the discharge tube and explain how canal rays were produced.

8. What will be the nature of charge on an atom when it loses an electron or when it gains an electron?
8. What will be the nature of charge on an atom when it loses an electron or when it gains an electron?
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8. What will be the nature of charge on an atom when it loses an electron or when it gains an electron?

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