MCQ questions for class 10 Science Chapter 5 Periodic Classification of Elements
Question 1: Who is known as the father of the periodic table?
Mendeleev
Rutherford
Dalton
Bohr
Question 2: How are elements arranged in the modern periodic table?
In increasing order of atomic mass
In increasing order of atomic number
In decreasing order of atomic mass
In alphabetical order
Question 3: Which element is placed in the same group as magnesium?
Sodium
Calcium
Aluminum
Silicon
Question 4: What is the valency of an element in Group 17 of the periodic table?
1
2
3
7
Question 5: What is the electronic configuration of oxygen?
1s² 2s² 2p²
1s² 2s² 2p⁶
1s² 2s² 2p⁴
1s² 2s² 2p⁵
Question 6: Which of the following is a halogen?
Sodium
Chlorine
Calcium
Iron
Question 7: What is the symbol for the element with atomic number 79?
Au
Ag
Hg
Pb
Question 8: Which element is a noble gas?
Helium
Neon
Argon
All of the above
Question 9: What is the atomic number of carbon?
5
6
7
8
Question 10: What is the modern periodic law?
Properties of elements are a periodic function of their atomic masses
Properties of elements are a periodic function of their atomic numbers
Properties of elements are a periodic function of their densities
Properties of elements are a periodic function of their volumes
Question 11: What is the trend in the reactivity of alkali metals down the group?
Increases
Decreases
Remains constant
Unpredictable
Question 12: Which of the following is a metalloid?
Boron
Sulfur
Phosphorus
Chlorine
Question 13: Which element is placed in the same period as fluorine?
Neon
Oxygen
Nitrogen
Sodium
Question 14: What is the chemical symbol for potassium?
K
P
Kr
Pt
Question 15: What is the common name for the element with atomic number 50?
Tin
Lead
Zinc
Copper
Question 16: What is the trend in electronegativity across a period?
Increases
Decreases
Remains constant
Unpredictable
Question 17: Which of the following elements has the highest electronegativity?
Fluorine
Oxygen
Nitrogen
Chlorine
Question 18: What is the trend in atomic size down a group?
Increases
Decreases
Remains constant
Unpredictable
Question 19: Which of the following elements has the smallest atomic size?
Lithium
Sodium
Potassium
Rubidium
Question 20: What is the chemical symbol for silver?
S
Si
Ag
Au
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