The modern periodic table is based on the: MCQ with Answer and Explanation

Question
The modern periodic table is based on the:
A. Atomic number of the elements
B. Number of neutrons
C. Density of the elements
D. Atomic mass of the elements
Answer: Option A
Solution (By JKSSB Mock Tests)
The modern periodic law states that the physical and chemical properties of elements are periodic functions of their atomic numbers. This was proposed by Henry Moseley, correcting Mendeleev's periodic table which was based on atomic mass. Atomic number determines the electronic configuration and thus chemical properties.
This question belongs to: Science chemistry
Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More chemistry Questions

Question #1
Which of the following is a micronutrient for plants?
A. Zinc
B. Potassium
C. Phosphorus
D. Nitrogen
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
Zinc (Zn) is a micronutrient required in small amounts for plant growth, enzyme activation, and chlorophyll synthesis. Nitrogen, phosphorus, potassium are macronutrients (primary). Micronutrients: Fe, Mn, Zn, Cu, B, Mo, Cl. Deficiency of Zn causes stunted growth and chlorosis. Fertilizers often include micronutrients.
This question belongs to: Science chemistry
Question #2
Which of the following is an allotropic form of carbon used in lead pencils?
A. Fullerene
B. Graphite
C. Charcoal
D. Diamond
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
Graphite mixed with clay forms pencil 'lead'. Its layered structure marks paper. Diamond is used in cutting, fullerene in nanotechnology, charcoal in filters and fuel.
This question belongs to: Science chemistry
Question #3
Modern periodic law states that properties of elements are periodic functions of their:
A. Atomic masses
B. Atomic numbers
C. Mass numbers
D. Number of isotopes
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
Modern periodic law: The physical and chemical properties of elements are periodic functions of their atomic numbers. This was established by Moseley. Mendeleev's periodic law was based on atomic masses. Atomic number (Z) determines electronic configuration, which determines chemical behavior. Mass numbers vary with isotopes.
This question belongs to: Science chemistry
Explore All chemistry MCQs
Today's Top Topics
Biology 2054 Physics 1287 chemistry 1089
Explore Subjects
Maths 5575 English 15164 Science 4430 Static General Knowledge 6362 Economy GK 2220
Practice Mix
Milk and water are in ratio 4:6 in a 273 L mixture. Quantity of milk?
The blaze ______ they doused was huge.
The 'Rani of Jhansi' is associated with:
The posters were ________ all over the city.
The principal that gives Rs. 453600 interest in 8 years at 9% SI is