How many marks does "Periodic Classification of Elements" carry in Bihar Board Class 10 Science?

In the Bihar Board papers of 2021–2026, this chapter carried about 2 marks and about 4 questions a year; by marks it ranks 14 in Science.

Which are the most important (VVI) questions of "Periodic Classification of Elements"?

The 5 questions above are from the board’s real papers, each with the years it was asked; the most-asked come first with their full model answers. All 5 written questions of this chapter, with answers, are in the AskMedha app.

Do the answers follow the board’s marking scheme?

BSEB does not publish a marking scheme. Each answer is written point by point on a structure derived from past papers and checked by a second, independent model; it is never called the board’s official scheme.

Bihar Board Class 10 · Science · Matric exam 2027

Chapter 5: Periodic Classification of Elements

This chapter’s questions from Bihar Board (BSEB)’s real papers of 2021–2026 — the 5 asked most often, 3 with the full model answer, 2 with how the answer begins — and objective questions with the board’s key.

marks a year (about): 2
questions a year (about): 4
rank in Science: #14

From 6 years of papers, 2021–2026 · full chapter-wise marks

Chapter 5 notes (PDF) →

VVI questions — the ones the board asked most (5)

Q1Short answer2 marksAsked: 2025
What do you understand by short and long periods of periodic table ?
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Model answer · periods, periodic table
1. 1.The second and third periods of the periodic table are called short periods because they contain 8 elements each.1 mark
2. 2.The fourth, fifth, and sixth periods of the periodic table are called long periods because they contain a larger number of elements.1 mark
- Write the exact term 'short periods' for second and third periods and mention '8 elements each'.
- Write the exact term 'long periods' for fourth, fifth, and sixth periods and mention 'larger number of elements'.
Marks split from a structure derived from past papers (checked twice); not Bihar Board’s official scheme
Q2Short answer2 marksAsked: 2026
Why are noble gases placed in a separate group in periodic table ?
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Model answer · noble gases, separate group
1. 1.Noble gases like helium, neon and argon are chemically inert and present in extremely low concentrations in our atmosphere. They have zero valency because they do not combine with other elements to form compounds.1 mark
2. 2.These gases have completely filled outermost shells, which means their outermost shell electronic configuration is already stable. This is why they are placed in a separate group 18 from other elements in the Periodic Table.1 mark
- State clearly that noble gases are inert and have zero valency in the first line.
- Use the exact phrase outermost shell and group 18 in the second paragraph.
- Do not add extra facts like discovery history of noble gases since the question does not ask for it.
Marks split from a structure derived from past papers (checked twice); not Bihar Board’s official scheme
Q3Short answer2 marksAsked: 2026
What is the modern periodic law ?
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Model answer · Modern Periodic Law
1. 1.According to the Modern Periodic Law, the properties of elements are a periodic function of their atomic number. This means that when elements are arranged in order of increasing atomic number, elements with similar properties recur after certain regular intervals. The atomic number gives the number of protons in the nucleus of an atom, and this number increases by one in going from one element to the next. On this basis, elements are classified in the Modern Periodic Table.2 marks
- Begin with the exact statement: 'Properties of elements are a periodic function of their atomic number.'
- Mention that atomic number gives the number of protons in the nucleus.
Marks split from a structure derived from past papers (checked twice); not Bihar Board’s official scheme
Q4Short answer2 marksAsked: 2023
What are the short periods and long periods of the periodic table? Write their number.
How the model answer begins
1. Short periods have fewer elements: periods 1, 2 and 3 — 3 short periods (2 elements in the first, 8 each in the second and third).
The full answer from Medha Ma’am →
Q5Short answer2 marksAsked: 2025
What do you understand by short and long periods of periodic table ?
How the model answer begins
1. The second and third periods of the periodic table are called short periods because they contain 8 elements each.
The full answer from Medha Ma’am →

Objective questions with the board’s key (10)

1. Bihar Board 2026
The vertical columns of Periodic Table are called
- (A) Groups ✓
- (B) Periods
- (C) Allotropes
- (D) None of these
Answer: (A)
2. Bihar Board 2026
The electronic configuration of an element is 2, 8, 7. What is the atomic number of this element ?
- (A) 10
- (B) 11
- (C) 17 ✓
- (D) 19
Answer: (C)
3. Bihar Board 2026
Which of the following is not a transition element ?
- (A) Ni
- (B) Cu
- (C) Fe
- (D) Ca ✓
Answer: (D)
4. Bihar Board 2026
Carbon belongs to which group of the periodic table ?
- (A) 3
- (B) 13
- (C) 6
- (D) 14 ✓
Answer: (D)
5. Bihar Board 2026
How many periods are there in the periodic table ?
- (A) 5
- (B) 6
- (C) 7 ✓
- (D) 8
Answer: (C)
6. Bihar Board 2026
How many electrons are there in the outer orbit of helium atom ?
- (A) 1
- (B) 2 ✓
- (C) 3
- (D) None of these
Answer: (B)
7. Bihar Board 2025
Which was a defect of Mendeleev's periodic table ?
- (A) Not giving proper place to oxygen
- (B) Not giving proper place to Cl
- (C) Not giving proper place to hydrogen ✓
- (D) None of these
Answer: (C)
8. Bihar Board 2025
Who among the following propounded the laws of octave ?
- (A) Mendeleev
- (B) Newlands ✓
- (C) Lother Meyer
- (D) Dobereiner
Answer: (B)
9. Bihar Board 2025
Magnesium is a member of which group of the periodic table ?
- (A) Group VIII
- (B) Group I
- (C) Group II ✓
- (D) Nonmetallic element
Answer: (C)
10. Bihar Board 2025
Which of the following groups form the Dobereiner's triad?
- (A) N, P, As
- (B) F, Cl, Br
- (C) Ca, Sr, Ba ✓
- (D) Be, Mg, Ca
Answer: (C)

Questions parents and students ask

How many marks does "Periodic Classification of Elements" carry in Bihar Board Class 10 Science?: In the Bihar Board papers of 2021–2026, this chapter carried about 2 marks and about 4 questions a year; by marks it ranks 14 in Science.
Which are the most important (VVI) questions of "Periodic Classification of Elements"?: The 5 questions above are from the board’s real papers, each with the years it was asked; the most-asked come first with their full model answers. All 5 written questions of this chapter, with answers, are in the AskMedha app.
Do the answers follow the board’s marking scheme?: BSEB does not publish a marking scheme. Each answer is written point by point on a structure derived from past papers and checked by a second, independent model; it is never called the board’s official scheme.

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