HARD
10th Manipur Board
IMPORTANT
Earn 100

Write down the electronic configuration of sodium (atomic number11), magnesium (atomic number 12), and oxygen (atomic number8). What are their valence electrons? What are their valencies? 

Important Questions on Periodic Classification of Elements

HARD
10th Manipur Board
IMPORTANT
Science for Class 10>Chapter 1 - Periodic Classification of Elements>Activity 1.3
Find out the valencies of the first twenty elements.
HARD
10th Manipur Board
IMPORTANT
Science for Class 10>Chapter 1 - Periodic Classification of Elements>Activity 1.3
Find out how does the valency vary in a period of going from left to right?
MEDIUM
10th Manipur Board
IMPORTANT
Science for Class 10>Chapter 1 - Periodic Classification of Elements>Activity 1.3
How does a valency vary in a group?
HARD
10th Manipur Board
IMPORTANT
Science for Class 10>Chapter 1 - Periodic Classification of Elements>Activity 1.4
Examine the elements of the second and third periods. Which of them are metals and which are non-metals?
MEDIUM
10th Manipur Board
IMPORTANT
Science for Class 10>Chapter 1 - Periodic Classification of Elements>Activity 1.4
On which side of the periodic table do you find the metals?
MEDIUM
10th Manipur Board
IMPORTANT
Science for Class 10>Chapter 1 - Periodic Classification of Elements>Activity 1.4
On which side of the periodic table do you find non-metals?
HARD
10th Manipur Board
IMPORTANT
Science for Class 10>Chapter 1 - Periodic Classification of Elements>Let us answer these>Q 1
What names have been given to the horizontal arrangement of elements in the periodic table? Is there any gradation in the properties of elements across these rows? Give two examples to illustrate. 
HARD
10th Manipur Board
IMPORTANT
Science for Class 10>Chapter 1 - Periodic Classification of Elements>Let us answer these>Q 2
How do the properties of group1 elements differ from those of group17 elements? Illustrate the differences in at least two properties.