KPK 9th Class Chemistry Chapter 2 Atomic Structure Short Questions Answers
KPK 9th Class Chemistry Chapter 2 Atomic Structure Short Questions with answers are combined for all 9th class(Matric/ssc) Level students.Here You can prepare all Chemistry Chapter 2 Atomic Structure short question in unique way and also attempt quiz related to this chapter.Just Click on Short Question and below Answer automatically shown. After each question you can give like/dislike to tell other students how its useful for each.
Class/Subject: 9th Class Chemistry
Chapter Name: Atomic Structure
Board: All KPK Boards
- Malakand Board 9th Class Chemistry Chapter 2 Atomic Structure short questions Answer
- Mardan Board 9th Class Chemistry Chapter 2 Atomic Structure short questions Answer
- Peshawar Board 9th Class Chemistry Chapter 2 Atomic Structure short questions Answer
- Swat Board 9th Class Chemistry Chapter 2 Atomic Structure short questions Answer
- Dera Ismail Khan Board 9th Class Chemistry Chapter 2 Atomic Structure short questions Answer
- Kohat Board 9th Class Chemistry Chapter 2 Atomic Structure short questions Answer
- Abbottabad Board 9th Class Chemistry Chapter 2 Atomic Structure short questions Answer
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KPK 9th Class Chemistry Chapter 2 Atomic Structure Short Questions Answers
Aluminium is represented as 27Al13. Draw the structure of Al. write its electronic configuration.
Structure of Al
Electronic Configuration of Al13 = 1s2, 2s2, 2p6, 3s2, 3p1
The energy of electron in K-shell and L- shell is same or different? Explain.
K is the 1st and L: is the 2nd shell of an atom. As we move away from nucleus, the distance of electron going to increase as a result the P.E of electron going to increase. And hence total energy of electron also increase.
Draw the structure of H-isotopes.
| Protium | Deutium | Tritium |
| P=1 E=1 N=0 A. No=1 A. Mass =1 |
P=1 E=1 N=1 A. No = 1 A. Mass = 2 |
P= 1 E= 1 N=2 A.No = 1 A.Mass = 3 |
- = P
o= N
How many electrons are present in each of the following atoms? Assuming that each is a neutral atom. Identify the element.
The identification of element and the total number of electron in each element w.r.t their electronic configuration is listed below.
Give
| Electronic Configuration | Atom | No of Electron |
| a.1s2, 2s2, 2p6, 3s1 | Na | 11 |
| b.1s2, 2s2, 2p6, 3s2, 3p5 | Cl | 17 |
| c.1s2, 2s2, 2p6, 3s2, 4s2 | Ca | 20 |
Why an atom is considered as neutral particle? Give reason.
Atom is consisted of charged particles like electron and proton. But atom as a self is a neutral particle. The reason is that atom is always consisted of equal number of electrons (-ve charge) & proton (+ve charge). Both the opposite charges cancel each other.
Example: Consider Na – atom
No of Electron = (-)11
Nio of Proton = (+)11/Net charge = 0
The mass of atom is present in nucleus. Can you explain it?
The heaviest particles of atom are proton and neutron. Research has shown that both these particles are located inside nucleus. The atomic mass is actually the mass of electron and neutron as,
A.Mass = No of P + No of N
Thus we can say that total mass of atom is contained by its nucleus.
What is the reason that physical properties of isotopes are different but their chemical properties are same?
Physical properties like mass density, volume depends on mass but chemical properties like reactions, depends on number of electrons. As isotopes have same number of electron thus have same chemical properties. But different atomic masses thus have different physical properties.
Example:
| Isotope of H-atom | No of Electrons | Mass |
| 1H1 | 1 | 1 |
| 1H2 | 1 | 2 |
| 1H3 | 1 | 3 |
Draw the structures of C – isotopes then write the number of electron, proton and neutron.
Carbon has three isotopic form as listed below.
| 6C12 | 6C13 | 6C14 |
| P = 6 E = 6 N = 6 A.No = 6 A. Mass = 12 |
P=6 E= 6 N=7 A.No = 6 A.Mass = 13 |
P=6 E=6 N= 8 A.No = 6 A.Mass = 14 |
Carbon Carbon – 13 Carbon – 14
6 Protons 6 protons 6 protons
6 Neutrons 7 Neutrons 8 Neutrons
Nuclear number Nuclear number Nuclear number
6 + 6 6 + 7 6 + 8
12 13 14
How many electrons are accommodated in K,L and M – Shell of an atom?
Electrons are arranged in different shells according to formula as
Shell N Electrons (2n2)
K 1 2 x12 =2en
L 2 2 x22 =8en
M 3 2 x32 =18en
Write detail electronic configuration of 3Li, 6C, 12Mg
Electrons configuration of 3Li, 6C, 12Mg is given below.
Atom Electronic configuration
3Li 1s2, 2s1
6C 1s2, 2s2, 2p2
12Mg 1s2, 2s2, 2p6, 3s2
Write the symbols for an isotope.
a) Containing one proton and two neutron.
b) Atomic number is one and there is one neutron.
c) Atomic number is one and mass number is also one.
a) Containing one proton and two neutron.
b) Atomic number is one and there is one neutron.
c) Atomic number is one and mass number is also one.
The symbols of above stated isotopes are listed below.
| Stated Isotope | Symbol |
| a. Containing one proton and two neutron. | Tritium 1H3 |
| b. Atomic number is one and there is one neutron | Deuterium 1H2 |
| c. atomic number is one and mass number is also one | Protium 1H1 |
