SCIENCE TEXTBOOK FOR CLASS IX>Chapter 4 - Structure of the Atom>Exercises>Q 8

EASY

9th CBSE

IMPORTANT

Earn 100

Explain with examples: Atomic number

Important Questions on Structure of the Atom

MEDIUM

9th CBSE

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 4 - Structure of the Atom>Exercises>Q 8

Explain with examples: Mass number

MEDIUM

9th CBSE

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 4 - Structure of the Atom>Exercises>Q 8

Explain with examples: Isotopes. Give any two uses of isotopes.

MEDIUM

9th CBSE

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 4 - Structure of the Atom>Exercises>Q 8

Explain with examples: Isobars.

MEDIUM

9th CBSE

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 4 - Structure of the Atom>Exercises>Q 9

N a^{+}

has completely filled

K

and

L

shells. Explain.

HARD

9th CBSE

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 4 - Structure of the Atom>Exercises>Q 10

If bromine atom is in the form of say two isotopes

_{35}^{79} Br (49.7 %)

and

_{35}^{81} Br (50.3%),

then calculate the average mass of bromine atom.

HARD

9th CBSE

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 4 - Structure of the Atom>Exercises>Q 11

The average atomic mass of a sample of an element

X

is

16.2 u

. What are the percentages of isotopes

_{8}^{16} X

and

_{8}^{18} X

in the sample?

MEDIUM

9th CBSE

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 4 - Structure of the Atom>Exercises>Q 12

If

Z = 3

, what would be the valency of the element? Also, name the element.

MEDIUM

9th CBSE

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 4 - Structure of the Atom>Exercises>Q 13

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

	X	Y
Protons =	$6$	$6$
Neutrons =	$6$	$8$

Give the mass numbers of

X

and

Y

. What is the relation between the two species?