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The Fundamental Unit of Life
Question
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The nuclear composition of two atomic species X and Y is



What is the relation between these two atomic species ? Name the element or elements they represent.

Answer

Atomic mass of X = 8 + 8 = 16
Atomic number of X =8
Atomic mass of Y = 8 + 10 = 18
Atomic number of Y = 8
Since X and Y have the same atomic no. 8, but different mass nos. 16 and 18, they are atoms of the element, oxygen and are the isotopes to each other.

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Some More Questions From The Fundamental Unit of Life Chapter

If Z = 3, what would be the valency of the element? Also, name the element.

Composition of the nuclei of two atomic species X and Y are given as under


                              X        Y
Protons  =                6        6
Neutrons=                6        6

Give the mass numbers of X and Y. What is the relation between the two species?

For the following statements, write T for True and F for False.

(a) J.J. Thomson proposed that the nucleus of an atom contains only nucleons.

(b) A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.

(c) The mass of an electron is about 1/2000 times that of proton.

(d) An isotope of iodine is used for making tincture iodine, which is used as a medicine.

Rutherford’s α-particle scattering experiment was responsible for the discovery of

Isotope of an element has

Number of valence electrons in Cl- ion are

Which one of the following is a correct ? Electronic configuration of sodium

(a) 2, 8,2 (b) 8, 2, 1 (c) 2, 1, 8 (d) 2, 8, 1.

Complete the following Table:


Atomic number

Mass number

Number of neutrons

Number of protons

Number of electrons

Name of the atomic species

9

-

10

-

-

-

16

32

-

-

-

Sulphur

-

24

-

12

-

-

-

2

-

1

-

-

-

1

-

1

0

-

How do you establish that matter is electrical in nature?