Isotopes, Isobars and Isotones

Q. What is the difference between allotropes and isotopes?

Q.

Which element has lowest number isotopes ?

1. Hydrogen

2. Oxygen

3. Iron

4. Carbon

Q.

Some boron atoms have mass number 10 and some have mass number 11. These boron atoms with different mass numbers are called_____

Q.

Name the atoms of a substance having the same atomic number, but different mass numbers. Give one example of such a substance. How do the structures of such atoms differ?

Q.

${}_{14}{}^{28}\mathrm{Si}$ and ${}_{14}{}^{29}\mathrm{Si}$ are called ___________.

Q.

Complete the statement:

The total number of protons and neutrons in the nucleus of an atom is called its ___.

Q.

Explain isotopes with examples.

Q.

What name is given to the triodes of atoms: ${}_7{}^{}\mathrm{N}^{13},{}_7{}^{}\mathrm{N}^{14}\mathrm{and}{}_7{}^{}\mathrm{N}^{15}$

Q.

Name the particles that determine the mass of an atom.

Q.

What is the term given to the atoms of an element with same atomic number but different mass number?

1. Isotopes

2. Isobars

3. Isotones

4. Isomers

Q.

1. Why only hydrogen isotopes are named like protium, deuterium and tritium. But not other isptopes .

For example three isotopes of hydrogen are named but there is no name for chlorine isotopes.

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. Isotopes of an element have different number of neutrons.

1. False
2. True

Q. Atoms having the same mass number but different atomic number are called:

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

Q. give reason why the two isotopes of chlorine have different mass number.

Q. Choose the correct pair of isotopes.

1. ${}_1^{1}H$
2. ${}_1^{2}H$
3. ${}_6^{12}C$
4. ${}_6^{14}C$
5. ${}_{53}^{127}I$
6. ${}_{53}^{131}I$
7. ${}_2^{3}He$
8. ${}_2^{4}He$

Q.

Constituents of nuclei of three atoms A, B and C are given below:
A - 90 protons and 148 neutrons
B - 92 protons and 146 neutrons
C - 90 protons and 146 neutrons
Based on the above data, which of these atoms are isotopes?

1. A and C are isotopes
2. A and B are isotopes
3. B and C are isotopes
4. A, B and C are isotopes

Q.

Which of the following are isotopes?

1. ${}_1^{1}H$, ${}_1^{2}H$, ${}_1^{3}H$
2. ${}_{20}^{40}Ca$, ${}_{18}^{40}Ar$
3. ${}_6^{12}C$, ${}_6^{13}C$, ${}_6^{14}C$
4. ${}_{26}^{58}Fe$, ${}_{27}^{58}Ni$

Q. The atomic number of an element is equal to the number of protons present in an atom.

1. True
2. False

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

1. isotopes
2. isomers
3. isobars

Q.

Isotopes of the same element have

1. different atomic numbers

2. same mass number

3. same atomic mass

4. different mass numbers

Q. Atoms with same mass numbers but different atomic number are called .

1. isotopes
2. isomers
3. isobars