MEDIUM
10th CBSE
IMPORTANT
Earn 100

What is the usual number of valence electrons and valency of group 18 elements of the periodic table?

Important Questions on Periodic Classification of Elements

EASY
10th CBSE
IMPORTANT
NEW ERA CHEMISTRY Textbook for Class X>Chapter 5 - Periodic Classification of Elements>MOCK TEST>Q 17
Which has a bigger size, argon or chlorine. Explain why?
HARD
10th CBSE
IMPORTANT
NEW ERA CHEMISTRY Textbook for Class X>Chapter 5 - Periodic Classification of Elements>MOCK TEST>Q 18
An element X (2, 8, 1) combines separately with NO3-,SO42-and PO43-radicals. Write the formulae of the three compounds formed. To which group of the periodic table does element "X" belong? Will it form covalent or ionic compounds? Why?
EASY
10th CBSE
IMPORTANT
NEW ERA CHEMISTRY Textbook for Class X>Chapter 5 - Periodic Classification of Elements>MOCK TEST>Q 19
Explain the following: Atomic radius of neon is bigger than that of fluorine.
MEDIUM
10th CBSE
IMPORTANT
NEW ERA CHEMISTRY Textbook for Class X>Chapter 5 - Periodic Classification of Elements>MOCK TEST>Q 19
Explain the following: Beryllium oxide is amphoteric while magnesium oxide is basic.
MEDIUM
10th CBSE
IMPORTANT
NEW ERA CHEMISTRY Textbook for Class X>Chapter 5 - Periodic Classification of Elements>MOCK TEST>Q 19
Explain the following: Carbon is a non-metal while silicon is a metalloid.
EASY
10th CBSE
IMPORTANT
NEW ERA CHEMISTRY Textbook for Class X>Chapter 5 - Periodic Classification of Elements>MOCK TEST>Q 19
Why do not elements present in a period show similar characteristic?
HARD
10th CBSE
IMPORTANT
NEW ERA CHEMISTRY Textbook for Class X>Chapter 5 - Periodic Classification of Elements>MOCK TEST>Q 20
The elements 3 to 10 belong to the second period. Answer the following questions relating to their periodic trends.
(i) The most electronegative element.
(ii) The element belonging to group 18.
(iii) The element which forms the largest number of organic compounds.
(iv) The element which shows a valency of -2
(v) The element which shows a valency of +1.
HARD
10th CBSE
IMPORTANT
NEW ERA CHEMISTRY Textbook for Class X>Chapter 5 - Periodic Classification of Elements>MOCK TEST>Q 20
Group of Numbers 1 2 13 14 15 16 17 18
  Li   D     O J Ne
  A Mg E Si   H K  
  B C   F G     L

Some elements are given above in their own symbol and position in the periodic table while others are shown with a letter. With reference to the table:
(i) Which is the most electronegative?
(ii) How many valence electrons are present in G?
(iii) Write the formula of the compound between B and H.
(iv) In the compound between F and J. What type of bond will be formed?
(v) Draw the electron dot structure for the compound formed between C and K.