State the common characteristic of the following elements : Boron, Silicon, Germanium and Arsenic
State the common characteristic of the following elements : Boron, Silicon, Germanium and Arsenic
Official answer
The Modern Periodic Law states that: 'The physical and chemical properties of elements are a periodic function of their atomic numbers.'
Marking scheme
- 1.State that properties of elements are a periodic function of their atomic numbers (1 Mark)
Hint
Recall how elements are arranged in the Modern Periodic Table—is it by atomic mass or atomic number?
Quick oral answer
The Modern Periodic Law states that the properties of elements are a periodic function of their atomic numbers.
Common mistakes
- 1.Writing 'atomic mass' instead of 'atomic number'.
- 2.Vaguely stating that elements are arranged in increasing order of atomic numbers without mentioning 'periodic function'.
Analysis and explanation
The Modern Periodic Law was proposed by Henry Moseley. It replaced Mendeleev's Periodic Law (which was based on atomic mass) by establishing that atomic number (the number of protons in an atom) is the fundamental property governing the chemical behavior and classification of elements.
Interesting facts
Henry Moseley discovered the relationship between X-ray spectra wavelengths and atomic numbers, which led to the formulation of the Modern Periodic Law in 1913.
Question details
Q2 of 39 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2020
- Section
- Section A
- Marks
- 1
- Type
- Very Short Answer
- Chapter
- Metals and Non-metals
- Topic
- Modern Periodic Table
- Bloom's level
- Remembering
- Syllabus topic
- Modern Periodic Law
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2020?
This question carries 1 mark in the CBSE Class 10 Science 2020 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Metals and Non-metals" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Modern Periodic Table" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2020 paper?
This is a Very Short Answer question from Section A in the CBSE Class 10 Science 2020 paper.