Isotopes

Q.

The atoms of different elements which have the same mass number are called______________.

Q. 59. If % abundance of two isotopes of carbon 6c12 and 6c14 are 90% and 10% respectively then number of c-12 atoms in 12g sample Wil be approximately??

Q.

Which of the following are the correct characteristics of isotopes of an element?

(i) same atomic mass (ii) same atomic number

(iii) same physical properties (iv) same chemical properties

(a) (i), (ii) and (iv) (b) (ii), (iii) and (iv) (c) (ii) and (iii) (d) (ii) and (iv)

Q.

If methane (CH₄₎ were to be made of isotopes C and H which are most abundant in nature, how many neutrons would be present in a single CH₄ molecule?

Q.

Chlorine is an element of atomic number 17. It is a mixture of two isotopes having mass number of 35 and 37.

Explain why the two atoms ${{}^{35}\mathrm{Cl}}_{17}$, ${{}^{37}\mathrm{Cl}}_{17}$have the same chemical reactions.

Q.

What would be the reason for an element to have atoms with different mass numbers?

Q. Isotopes are those atoms having same atomic number but different mass number. Which of the following is NOT the property of isotopes?

1. They have same atomic number.
2. They have same chemical properties.
3. They have same physical properties.
4. They have same position in the periodic table

Q.

Tin has ten isotopes.

1. True
2. False

Q.

Do isobars belong to the same element?

Q.

Define isotope.

Q. Boron naturally occurs as a mixture of boron-10 and boron-11 isotopes. The percentage abundance of B-10 is 20 and that of B-11 is 80. Calculate the average atomic mass of boron using the given data.

1. 16 u
2. 10.8 u
3. 11 u
4. 13 u

Q.

Name the following:

Radioactive isotope used for determining the age of fossil fuel.

Q. Atoms of the same element with different mass numbers are known as

1. Isobars
2. Isomers
3. Isotopes
4. Isotones

Q. Match the column (unitary match) .
Column-I (Complex ion) match with Column-II (Value charge on Complex ion).

Q.

Question 16
Which of the following are the characteristics of isotopes of an element?

(i) Isotopes of an element have same atomic masses
(ii) Isotopes of an element have same atomic number
(iii) Isotopes of an element show same physical properties
(iv) Isotopes of an element show same chemical properties

(a) (i), (iii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)

Q.

The four atomic species can be represented as given below. Which of these are isobars?

1. ${}_{60}{}^{201}\mathrm{X}$
2. ${}_{61}{}^{200}\mathrm{X}$
3. ${}_{58}{}^{200}\mathrm{X}$
4. ${}_{60}{}^{203}\mathrm{X}$

1. (1) and (2)

2. (2) and (4)

3. (2) and (3)

4. (1) and (4)

Q. Chlorine has atomic fractional due to mass 35.5. This mass is:

1. existence of electrons
2. rapid conversion of proton into neutron and vice-versa in nucleus
3. fractional atomic masses are meaningless
4. existence of isotopes having different m classes

Q.

Hydrogen has ______ isotopes.

Q.

Give one example of isobars.

Q.

How can you define the term “isobar”? Give its one example.

Q.

Some carbon atoms have mass number 12 and some have mass number 14. These atoms of different mass numbers are called ______.

Q.

2. Tick the most appropriate answer.

(ii) The number of radioactive elements are:

1. 92

2. 82

3. 36

4. 62

Q.

There are two elements 13 (A )and 14 (B).

Find the number of sub-atomic particles in each of these. What is the relation between these atoms?

Particles	Mass number	Atomic number	No. protons	No. electrons	No. neutrons
A	26	13	13	13	13
B	26	14	14	14	12

Q. What is the reason for the different atomic masses of the isotopes of an element?

Q.

Give two uses of isotopes.

Q. Atoms of the same element having the same atomic number but different mass are called _________.

1. atomic number
2. isotopes
3. mass number
4. isobars

Q.

Protium has 1 neutron.

1. True
2. False

Q. Name the element and its valency with electronic configuration 2, 8, 4.

Q.

${}_{12}^6\text{C}{,}_{14}^6\text{C}{,}_{16}^6\text{C}$ differ in number of __________.

1. Protons

2. Electrons

3. Neutrons

4. Sum of protons and electrons

Q.

Write brief notes on:

Isotopes.