Isotopes

Q.

What is light water and heavy water?

Q.

Two elements $\mathrm{X}$ and $\mathrm{Y}$ have the same atomic mass but their atomic numbers are $20$ and $21$ respectively. $\mathrm{X}$ and $\mathrm{Y}$ are:

1. Isobars

2. Isotones

3. Isomers

4. Isotopes

Q.

Out of C-12 and C-14 isotopes of Carbon, which is of radioactive nature?

Q.

Who discovered the proton? Based on what experiment was he able to discover these protons?

Q. Assertion :The mass spectrometer is used for determination of the atomic mass of isotopes.
Reason: Isotopes are the atoms of the same element having a same atomic number but different mass numbers.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is incorrect but Reason is correct
4. Both Assertion and Reason are incorrect

Q. Answer the following questions:
(A) Explain Isotopes, Isobars and Isotones along with examples. [3 Marks]​

(B) The atomic composition of element A is as follows: number of neutrons = x, atomic mass = 12, number of electrons = 6. The atomic composition of B is as follows: number of neutrons = y, atomic mass = 28, number of electrons = number of electrons in A + 8. Compute the ratio of x to y. [2 Marks]

Q.

Five atoms are labelled V to Z

Atoms	Mass number	Atomic Number
V	40	20
W	19	9
X	7	3
Y	16	8
Z	14	7

Write down the formula of the compound formed by atoms X and Y.

Q.

What are isotopes give one example?

Q.

Please help Sanjam to complete the following table:

Isotopes of Hydrogen	No. of protons	No. of electrons	No. of neutrons
${}_1{}^2\mathrm{H}$		1

Q. Isotopes have similar mass number.

1. True
2. False