Periodic Classification of Elements Notes solutions and Exercises 10th Science 1 | SSC Class 10 Maha
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- Опубликовано: 13 сен 2024
- In this video I have explained Chapter 2 - Periodic Classification of Elements for students of 10th standard from the Maharashtra State Board.
In this lecture, I have provided notes for the chapter Periodic Classification of Elements which includes solutions to the exercises given behind the textbook.
Each question has been explained in detail.
00:46 - Question 1. Rearrange the columns 2 and 3 so as to match with the column 1.
i. Triad a. Lightest and negatively charged particle in all the atoms 1. Mendeleev
ii. Octave b. Concentrated mass and positive charge 2. Thomson
iii. Atomic number c. Average of the first and the third atomic mass 3. Newlands
iv. Period d. Properties of the eighth element similar to the first 4. Rutherford
v. Nucleus e. Positive charge on the nucleus 5. Dobereiner
vi. Electron f. Sequential change in molecular formulae 6. Moseley
05:24 - Periodic Classification Of Elements Class 10 Maharashtra Board Question 2.Choose the correct option and rewrite the statement:(a) The number of electrons in the outermost shell of alkali metals is…….(a) 1(b) 2(c) 3(d) 7
(b) Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in…….(a) Group 2(b) Group 16(c) Period 2(d) d-block
(c) Molecular formula of the chloride of an element X is XCl. This compound is a solid having high melting point. which of the following elements be present in the same group as X.(a) Na(b) Mg(c) Al(d) Si
(d) In which block of the modem periodic table are the nonmetals found?(a) s-block(b) p-block(c) d-block(d) f-block
08:31 - Chapter 2 Periodic Classification Of Elements Notes Question 3.An element has its electron configuration as 2, 8, 2. Now answer the following questions.a. What is the atomic number of this element?
b. What is the group of this element?
c. To which period does this element belong?
d. With which of the following elements would this element resemble? (Atomic numbers are given in the brackets)N(7), Be(4), Ar(18), Cl(17)
14:39 - Class 10 Science 1 Chapter 2 Periodic Classification Of Elements Solutions Question 4.Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
a. 3Li, 14Si, 2He, 11Na, 15P which of these elements belong to be period 3?
b. 1H, 7N, 20Ca, 16S, 4Be, 18Ar. Which of these elements belong to the second group?
c. 7N, 6C, 8O, 5B, 13Al Which is the most electronegative element among these?
d. 4Be, 6C, 8O, 5B, 13Al Which is the most electropositive element among these?
e. 11Na, 15P, 17Cl, 14Si, 12Mg which of these has largest atoms?
f. 19K, 3li, 11Na, 4Be Which of these atoms has smallest atomic radius?
g. 13Al, 14Si, 11Na, 12Mg, 16S Which of the above elements has the highest metallic character?
h. 6C, 3Li, 9F, 7N, 8O Which of the above elements has the highest nonmetallic character?
35:01 - Question 5.Write the name and symbol of the element from the description.a. The atom having the smallest size.
b. The atom having the smallest atomic mass.
c. The most electronegative atom.
d. The noble gas with the smallest atomic radius.
e. The most reactive nonmetal.
38:23 - Class 10 Science Chapter 2 Periodic Classification Of Elements Question 6.Write short notes.
a. Mendeleev’s periodic law. b. Structure of the modern periodic table.
c. Position of isotopes in the Mendeleev’s and the modern periodic table.
42:13 - Class 10 Science Chapter 2 Periodic Classification Of Elements Question 7. Write scientific reasons.
a. Atomic radius goes on decreasing while going from left to right in a period.
b. Metallic character goes on decreasing while going from left to right in a period.
c. Atomic radius goes on increasing down a group.
d. Elements belonging to the same group have the same valency.
e. The third period contains only eight elements eventhough the electron capacity of the third shell is 18.
49:50 - Question 8.Write the names from the description.a. The period with electrons in the shells, K, L and M.
b. The group with valency zero.
c. The family of nonmetals having valency one.
d. The family of metals having valency one.
e. The family of metals having valency two.
f. The metalloids in the second and third periods.
g. Nonmetals in the third period.
h. Two elements having valency 4.
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Sir apaki notification ayi apane notes banaye 2 second lesson ke thanku sir 😊
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The Electronic Configuration of CL (17) is 2,8,7😊
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Sir vese hi ek period me no. of shell same hota he par 3rd period tak hi posible he
Aur 4th period ke potassium ka electronic configuration he 2,8,8,1 it's 4 shells
And Krypton ka he 2,8,8,8,8,2 it's 5 shell
but this both element belong tu same period
And aur ek kahavat he ki period me left to right jate vakt atom ka size decrease hota but yiske sath vupar ke element me no. Of shell badh raha he yani ki Krypton potassium se bada hona chahiye😢😢 please reply😊
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Sir henry moseley on page number 20 modern periodic law
Thankyou sir❤
Correct
12:40 2,8,7
Sir mujhe ek confusion hai.
Kya science subject ka digest use karna hai 10th me
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2,8,7 - electronic configuration of Cl(17)
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You are welcome 😊
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Sir Q,8 second answer
Thank you so much sir for notes 😊
chlorine 2,8,7
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chlorine 2,8,7 , 18th group or zero group
Electron configuration of CL is 2,8,7
18.19 electronic configuration of 15p=2,8,5
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Mere ek dout he ki
Agar har group me elements ki outermost shell me same no of electron hota he iske hisab se group 1 me outermost shell me 1 electron hone chahiye.
But group 1 ke rubidium ke outermost shell me 3 electron he
Please solve my doubt
10th level pe Rubidium ka mat socho. But still Rubidium atoms have 37 electrons and the Electron configuration of Rubidium is 2,8,18,8,1.
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CI (17) Answer: (2,8,7) 😊
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18:20 phosphorus(P)- 2,8,5
Right 👍🏻
Electronic configuration of Cl 17= 2,8,7
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2'8'7 ans
P 15 ans 2,8,5 😊
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Q3) d) Cl (17) - 2,8,7
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Moseley
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18:19 2,8,5
(2,8,5)
Cl- 2,8,7
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Pg:20
15p 2,8,5
Sir effects of current electricity
p-15 =2,8,5
2,8,5.
(2,8,7) is the answer of Cl(17)
Please sir 1and 2 ch notes
Notes kidhar he
2,8,5 is answer of p15
Cl - 2,8,7😊
Cl(17)=2,8,7
2,8,5
2 8 7 is answer
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16:21 answer is 32
32
2,8,5 = 15P
Hi
Notes kidhar he😢
Cl 287
Hii
2,8,5 18:21
Sorry
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Thank you sir
(2,8,7)
Notes kidhar he
2,8,7
2,8,5 = 15P
Cl 2,8,7
Correct
12:52 2,8,7
Notes kidhar he
Notes kidhar he
Notes kidhar he