ATOMIC STRUCTURE

Winmeen

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Unit – IV ATOMIC STRUCTURE - CHEMISTRY

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Question 1

Total number of electrons that can be accommodated in an orbit is given by 2n² Maximum number of electrons that can be present in the first orbit is…………

A	8
B	2
C	18

Question 2

Goldstein discovered protons. It is present in the nucleus charge on the proton is.

A	negative
B	Positive
C	neutral

Question 3

A subatomic particle is revolving around the nucleus in orbits. It is negatively charged. It was discovered by J.J. Thomson. The Particle is…………..

A	Proton
B	neutron
C	electron

Question 4

Number of neutrons present in 73 Li is 4. The number of neutrons present in 168O is…………

A	8
B	7
C	6

Question 5

Nucleus of an atom has two components. They are protons and……………..

A	Protons
B	neutrons
C	electrons

Question 6

The sum of the number of protons and neutrons present in the nucleus is called mass number. Find the number of protons in the following element.

Elements	Mass Number	Number of Protons	Number of Neutrons
Sodium	23	?	12

A	12
B	23
C	11

Question 7

Atomic number and mass number of 35 17Cl are 17 and 35 respectively. The number of protons present in it is……………..

A	17
B	35
C	18

Question 8

………….. isotope is used for the treatment of goiter.

A	Iodine -131
B	phosphorus -32
C	Iron – 59

Question 9

The electron distribution of fluorine is 2, 7. The valency of fluorine is …………….

A	7
B	2
C	1

Question 10

Electron distribution of solution is 2,8,1. The valency of sodium……

A	2
B	8
C	1

Question 11

Every atom has equal number of protons and electrons. Both are oppositly charged. Neutron is electrically neutral. Neutron is electrically neutral. The nature of atom is …………….

A	Positive
B	negative
C	neutral

Question 12

Father of Nuclear Physics

A	J.J Thomson
B	Rutherford
C	Newton
D	Chadwick

Question 13

The mass of the atoms is due to the mass of

A	protons
B	neutrons
C	nucleus
D	electrons

Question 14

Alpha particles are ………… ions.

A	Hydrogen
B	Oxygen
C	Nitrogen
D	Helium

Question 15

…………… discovered that electrons revolve around the nucleus in stationary circular paths.

A	Dalton
B	Rutherford
C	Neils Bohr
D	James Chadwick

Question 16

Protons and neutrons are collectively called …………….

A	electrons
B	nucleus
C	Mesons
D	nucleons

Question 17

Isotopes differ in…………..

A	Mass number
B	atomic number
C	the number of protons
D	the number of electrons

Question 18

The atomic number and mass number of sodium are 11 and 23 respectively. The number of neutrons is……….

A	11
B	23
C	34
D	12

Question 19

…………. Has fractional atomic mass.

A	chlorine
B	Hydrogen
C	oxygen
D	Nitrogen

Question 20

………… is used for treatment of goiter.

A	iron – 59
B	iodine – 131
C	cobalt – 60
D	carbon – 11

Question 21

……….. is used in the treatment of cancer.

A	iron – 59
B	iodine – 131
C	cobalt – 60
D	carbon – 11

Question 22

……….. is used in the treatment of Anaemia.

A	iron – 59
B	iodine – 131
C	cobalt – 60
D	carbon – 11

Question 23

………… is used in brain scan.

A	iron – 59
B	iodine – 131
C	cobalt – 60
D	carbon – 11

Question 24

……….is used in eye treatment.

A	iron – 59
B	iodine – 131
C	phosphorous – 32
D	Cobalt – 60

Question 25

The maximum number of electrons in L shell is……………..

A	2
B	8
C	18
D	32

Question 26

The electronic configuration of Boron is 2,3 Its valency is …………………..

A	2
B	4
C	5
D	3

Question 27

Neutron was discovered by

A	Rutherford
B	Goldstein
C	Chadwick
D	J.J Thomson

Question 28

The nagatively charged particles are

A	electrons
B	protons
C	mesons
D	neutrons

Question 29

…………… have negligible mass.

A	electrons
B	protons
C	mesons
D	neutrons

Question 30

……………. Is radioactive Hydrogen.

A	Protium
B	Deuterium
C	Tritium
D	none of these

Question 31

When an electron moves from a higher energy level to lower energy level energy…………..

A	increases
B	is absorbed
C	is given off
D	there is no change

Question 32

…………… proposed the idea of atom as the smallest possible particle of any substance.

A	Rutherford
B	Dalton
C	Goldstein
D	Chadwick

Question 33

…………… performed the gold foil experiment with alpha particles to conclude that positive charge is at the centre of an atom

A	Rutherford
B	Dalton
C	Goldstein
D	Chadwick

Question 34

………….. discovered the protons

A	Rutherford
B	Dalton
C	Goldstein
D	Chadwick

Question 35

………… discovered the neutrons of an atom.

A	Rutherford
B	Dalton
C	Goldstein
D	Chadwick

Question 36

………… modified the atomic model with electrons revolving around the nucleus in stationary paths

A	Rutherford
B	Niels bohr
C	Goldstein
D	Chadwick

Question 37

Match the following

Sl.No	Name of Scientist	Discovery
1	Ernest Rutherford	a) Proton
2	J.J.Thomson	b) Neutrons
3	Goldstein	c) Nucleus
4	Chadwick	d) Electrons

A	2 3 1 4
B	4 1 2 3
C	3 4 1 2
D	1 4 3 2

Question 38

Match the following

Sl.No	Orbit	No.Of Electrons
1	K shell	a) 8
2	M shell	b) 32
3	L shell	c) 18
4	N shell	d) 2

A	3 4 2 1
B	1 4 3 2
C	3 4 1 2
D	4 1 2 3

Question 39

Match the following elements with their atomic number.

Sl.No	Elements	Atomic Number
1	Boron	a) 13
2	Carbon	b) 12
3	Magnesium	c) 5
4	Aluminium	d) 6

A	3 1 2 4
B	4 3 1 2
C	2 4 1 3
D	1 4 3 2

Question 40

Match the following elements with their valencies.

Sl.No	Elements	Valency
1	Hydrogen	a) 3
2	Oxygen	b) 4
3	Carbon	c) 2
4	Aluminium	d) 1

A	3 2 1 4
B	4 3 2 1
C	2 4 1 3
D	1 4 3 2

Question 41

Reason and Assertion

Assertion (A) : Electrons revolve around the nucleus in stationary circular paths.
Reason (R) : The paths are called orbits or shells or energy levels.

A	A is right R is wrong
B	A is wrong R is right
C	A is right R explains A
D	R does not explain A

Question 42

Assertion (A) : There is a heavy positive charge at the centre of an atom
Reason (R) : An atom is positively charged.

A	A is correct R is wrong
B	A is wrong R is correct
C	A is correct R explains A
D	Both A and R are correct

Question 43

Assertion (A) : Isotopes of an element have same chemical properties
Reason (R) : Isotopes differ in atomic number.

A	A is correct R is wrong
B	A is wrong R is correct
C	A is correct R explains A
D	Both A and R are correct

Question 44

Assertion (A) : To write electronic configuration the principal quantum number must be known.
Reason (R) : The number describes the number of orbits present in the atom.

A	A is correct R is wrong
B	A is wrong R is correct
C	A is correct R explains A
D	R does not explain A

Question 45

Assertion (A) : The electronic configuration of sulphur is 2,8,6
Reason (R) : The electronic configuration of argon is 2,8,8

A	A is correct R is wrong
B	A is wrong R is correct
C	R explaines A
D	A is correct R does not explain A

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Unit – IV ATOMIC STRUCTURE - CHEMISTRY

Winmeen

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