Name the non-metals in the first twenty elements.

One Line Answer

C, N, O, F, Ne, P, S, Cl, Ar, H and He.

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Chapter 1 Periodic Table, Periodic Properties and Variations of Properties
lntext Questions | Q 10. (iii) | Page 5

What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?

Name two elements in Alkali metals.

Name an alkali metal in period 3 and halogen in period 2.

Define the atomic size.

State what is meant by the term chemical formula.

Which of the following statements about the Modern Periodic Table is correct:

Which of the following elements does not lose an electron easily?

Compare the radii of two species X and Y. Give reasons for your answer.

₁H² is an isotope of hydrogen. In the modern Periodic Table it will ______.

Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?