EASY
10th CBSE
IMPORTANT
Earn 100

How many shells are present in the elements of the second period?

Important Questions on Periodic Classification of Elements

MEDIUM
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>PRACTICE QUESTIONS SET>Q 2
Write the number of vertical columns in the modern periodic table. What are these columns called?
MEDIUM
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>PRACTICE QUESTIONS SET>Q 3
An element 'X' has mass number 35  and number of neutrons 18. Write atomic number and electronic configuration of 'X'. Also write group number, period number and valency of 'X'
HARD
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>PRACTICE QUESTIONS SET>Q 4
Two elements 'P' and 'Q' belong to the same period of the modern periodic table and are in Group-1 and Group-2 respectively. Compare their following characteristics in tabular form :
(a) The number of electrons in their atoms   
(b) The sizes of their atoms
(c) Their metallic characters 
(d) Their tendencies to lose electrons
(e) The formula of their oxides 
(J) The formula of their chlorides. 
 
HARD
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>PRACTICE QUESTIONS SET>Q 5
From the following elements :  Be4, F9, K19 and Ca20   
Select
(a) the element having one electron in the outermost shell.
(b) two elements of the same group.
Write the formula of and mention the nature of the compound formed by the union of K19 and element X (2,8,7).
 
MEDIUM
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>PRACTICE QUESTIONS SET>Q 6
Differentiate between the arrangement of elements in Mendeleev's periodic table and Modern periodic table.
MEDIUM
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>PRACTICE QUESTIONS SET>Q 7

A non-metal A is an important constituent of our food and forms two oxides B and C. Oxide B is toxic whereas C causes global warming.

(a) Identify A, B and C.
(b) To which group of periodic tables does A belong?

MEDIUM
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>PRACTICE QUESTIONS SET>Q 8
Mention one property each of the elements in a group and of elements in a period in the modern periodic table.
EASY
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>PRACTICE QUESTIONS SET>Q 1
What do you mean by periodicity in properties? What is its main cause?