Q2
1 markVery Short AnswerSection A

State the common characteristic of the following elements : Boron, Silicon, Germanium and Arsenic

Metals and Non-metals
Modern Periodic Table
Official Answer

The Modern Periodic Law states that: 'The physical and chemical properties of elements are a periodic function of their atomic numbers.'

periodic functionatomic numbersproperties of elements

Marking Scheme

  • 1State 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.

Analysis & 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.

Common Mistakes

  1. 1Writing 'atomic mass' instead of 'atomic number'.
  2. 2Vaguely stating that elements are arranged in increasing order of atomic numbers without mentioning 'periodic function'.

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.

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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.