ICSE Chemistry Class X Important Papers By M. P. Keshari
Periodic Properties and Variation in Properties
Q. 1. State the number of elements in Period 1, Period 2 and Period 3 of the Periodic Table.
Ans : - There are 2 elements in Period 1 and 8 elements in each of Period 2 and Period 3.
Q. 2. Name the elements in Period 1.
Ans : - Hydrogen and Helium.
Q. 3. What happens to atomic size of elements on moving from left to right in a period?
Ans : - The atomic size of elements on moving from left to right in a period decreases.
Q. 4. What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 3?
Ans : - The atoms of the elements at the end of Period 2 and Period 3 has 8 electrons in their outermost shell.
Q. 5. If an element is in group 7 (or group 7A), is it likely to be metallic or non- metallic in character?
Ans.: - Non-metallic.
Q. 6. Supply the missing word from those in brackets:
Ans : - Metallic.
Q. 7. Complete the following sentences using the correct word.
Ans : - (i) atomic number (ii) period, non-metallic (iii) more (iv) number of outer electrons.
Q. 8. What is meant by a Group in the Periodic Table?
Ans : - The vertical column in a periodic table are called group.
Q. 9. Within a group where would you expect to find the element with:
Ans : - (a) At the bottom of the group. (b) At the bottom of the group.
Prepared By Mr. M.P. Keshari
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