Radioactivity

Q.

What are the limitations of Rutherfords model of the atom?

Q.

What were the drawbacks of Rutherfords Atomic Model?

Q.

Why Argon has 22 neutrons?

Q.

What were the conclusions made by Rutherford as a result of alpha particle scattering experiment?

1. The center of the atom is empty

2. Most part of the atom is empty

3. The center of atom has negative charge

4. The center of atom has no charge

Q.

What is the most dangerous element?

Q. When is the nucleus said to be unstable?

Q.

State one use of radioactive isotopes in industry.

Q.

Isotope of iodine is used for making tincture of iodine in medicines. Is it true or false?

1. False

2. True

Q. Question 43
In the gold foil experiment of Geiger and Marsden, that paved the way for Rutherford's model of an atom, $1.00\%$ of the alpha-particles were found to deflect at angles $>{50}^{\circ }$. If one mole of alpha-particles were bombarded on the gold foil, compute the number of alpha-particles that would deflect at angles less than ${50}^{\circ }$.

Q.

Which radioactive isotope is used to determine the activity of thyroid gland ?

Q.

Which one of the following isotope is used as a fuel in nuclear reactors?

1. An isotope of thorium

2. An isotope of uranium

3. An isotope of iodine

4. An isotope of cobalt

Q.

What name is given to those isotopes which have unstable nuclei and emit various types of radiations ?

Q.

Give one example of a radioactive isotope which is used as a fuel in the reactors of nuclear power plants.

Q.

Give one use each of the following radioactive isotopes :

(a) Uranium-235

(b) Cobalt-60

Q. Particle come out from unstable nucleus is an alpha particle. So when beta particle come out , on which condition of nucleus beta particle come out?

Q.

Explain the drawbacks of Rutherfords model of the atom?

Q.

How are radioactive isotopes used in nuclear power plants?

Q. Write the uses of radioactive substances.

Q.

76 (ii) Why is radon used in cancer treatment ?

Q.

Differentiate between the properties of isotopes of chlorine.

Q.

Name the radioactive isotope which is used in the treatment of cancer.

Q. is a radioactive element.

1. Uranium
2. Sodium
3. Magnesium

Q.

Differentiate between the properties of isotopes of carbon.

Q. All alpha particles have a charge of

1. 0
2. - 2
3. 1
4. 2

Q. Question 6 (c)
The position of three elements A, B and C in the periodic table are shown below –
$\begin{array}{cc}\text{Group 16}& \text{Group 17}\\ -& -\\ -& \text{A}\\ -& -\\ \text{B}& \text{C}\end{array}$
Will C be larger or smaller in size than B?

Q.

What is the source of alpha particles in Rutherfords scattering experiment?

Q. Elements exhibiting the property of radioactivity have:

1. stable nucleus
2. stable electronic configuration
3. unstable nucleus
4. unstable electronic configuration

Q.

State whether the following statement is true or false : Radioactive isotope of iodine is used for making the medicine called tincture iodine.

Q.

(a) What are radioactive isotopes? Give two ex­amples.

Q.

Which of the following pairs are isotopes?

1. ${}_{84}{}^{}\mathrm{X}^{209}\mathrm{and}{}_{84}{}^{}\mathrm{X}^{210}$

2. ${}_{90}{}^{}\mathrm{X}^{232}\mathrm{and}{}_{91}{}^{}\mathrm{X}^{232}$