Periodic Classification of Elements Notes solutions and Exercises 10th Science 1 | SSC Class 10 Maha

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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