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ATOMIC STRUCTURE
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…………
8 | |
2 | |
18 |
Question 2 |
Goldstein discovered protons. It is present in the nucleus charge on the proton is.
negative | |
Positive | |
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…………..
Proton | |
neutron | |
electron |
Question 4 |
Number of neutrons present in 73 Li is 4. The number of neutrons present in 168O is…………
8 | |
7 | |
6 |
Question 5 |
Nucleus of an atom has two components. They are protons and……………..
Protons | |
neutrons | |
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 |
12 | |
23 | |
11 |
Question 7 |
Atomic number and mass number of 35 17Cl are 17 and 35 respectively. The number of protons present in it is……………..
17 | |
35 | |
18 |
Question 8 |
………….. isotope is used for the treatment of goiter.
Iodine -131 | |
phosphorus -32 | |
Iron – 59 |
Question 9 |
The electron distribution of fluorine is 2, 7. The valency of fluorine is …………….
7 | |
2 | |
1 |
Question 10 |
Electron distribution of solution is 2,8,1. The valency of sodium……
2 | |
8 | |
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 …………….
Positive | |
negative | |
neutral |
Question 12 |
Father of Nuclear Physics
J.J Thomson | |
Rutherford | |
Newton | |
Chadwick |
Question 13 |
The mass of the atoms is due to the mass of
protons | |
neutrons | |
nucleus | |
electrons |
Question 14 |
Alpha particles are ………… ions.
Hydrogen | |
Oxygen | |
Nitrogen | |
Helium |
Question 15 |
…………… discovered that electrons revolve around the nucleus in stationary circular paths.
Dalton | |
Rutherford | |
Neils Bohr | |
James Chadwick |
Question 16 |
Protons and neutrons are collectively called …………….
electrons | |
nucleus | |
Mesons | |
nucleons |
Question 17 |
Isotopes differ in…………..
Mass number | |
atomic number | |
the number of protons | |
the number of electrons |
Question 18 |
The atomic number and mass number of sodium are 11 and 23 respectively. The number of neutrons is……….
11 | |
23 | |
34 | |
12 |
Question 19 |
…………. Has fractional atomic mass.
chlorine | |
Hydrogen | |
oxygen | |
Nitrogen |
Question 20 |
………… is used for treatment of goiter.
iron – 59 | |
iodine – 131 | |
cobalt – 60 | |
carbon – 11 |
Question 21 |
……….. is used in the treatment of cancer.
iron – 59 | |
iodine – 131 | |
cobalt – 60 | |
carbon – 11 |
Question 22 |
……….. is used in the treatment of Anaemia.
iron – 59 | |
iodine – 131 | |
cobalt – 60 | |
carbon – 11 |
Question 23 |
………… is used in brain scan.
iron – 59 | |
iodine – 131 | |
cobalt – 60 | |
carbon – 11 |
Question 24 |
……….is used in eye treatment.
iron – 59 | |
iodine – 131 | |
phosphorous – 32 | |
Cobalt – 60 |
Question 25 |
The maximum number of electrons in L shell is……………..
2 | |
8 | |
18 | |
32 |
Question 26 |
The electronic configuration of Boron is 2,3 Its valency is …………………..
2 | |
4 | |
5 | |
3 |
Question 27 |
Neutron was discovered by
Rutherford | |
Goldstein | |
Chadwick | |
J.J Thomson |
Question 28 |
The nagatively charged particles are
electrons | |
protons | |
mesons | |
neutrons |
Question 29 |
…………… have negligible mass.
electrons | |
protons | |
mesons | |
neutrons |
Question 30 |
……………. Is radioactive Hydrogen.
Protium | |
Deuterium | |
Tritium | |
none of these |
Question 31 |
When an electron moves from a higher energy level to lower energy level energy…………..
increases | |
is absorbed | |
is given off | |
there is no change |
Question 32 |
…………… proposed the idea of atom as the smallest possible particle of any substance.
Rutherford | |
Dalton | |
Goldstein | |
Chadwick |
Question 33 |
…………… performed the gold foil experiment with alpha particles to conclude that positive charge is at the centre of an atom
Rutherford | |
Dalton | |
Goldstein | |
Chadwick |
Question 34 |
………….. discovered the protons
Rutherford | |
Dalton | |
Goldstein | |
Chadwick |
Question 35 |
………… discovered the neutrons of an atom.
Rutherford | |
Dalton | |
Goldstein | |
Chadwick |
Question 36 |
………… modified the atomic model with electrons revolving around the nucleus in stationary paths
Rutherford | |
Niels bohr | |
Goldstein | |
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 |
2 3 1 4 | |
4 1 2 3 | |
3 4 1 2 | |
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 |
3 4 2 1 | |
1 4 3 2 | |
3 4 1 2 | |
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 |
3 1 2 4 | |
4 3 1 2 | |
2 4 1 3 | |
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 |
3 2 1 4 | |
4 3 2 1 | |
2 4 1 3 | |
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 is right R is wrong | |
A is wrong R is right | |
A is right R explains A | |
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 is correct R is wrong | |
A is wrong R is correct | |
A is correct R explains A | |
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 is correct R is wrong | |
A is wrong R is correct | |
A is correct R explains A | |
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 is correct R is wrong | |
A is wrong R is correct | |
A is correct R explains A | |
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 is correct R is wrong | |
A is wrong R is correct | |
R explaines A | |
A is correct R does not explain A |
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