MEDIUM
10th Manipur Board
IMPORTANT
Earn 100

Do 2nd and 3rd period of the periodic table elements contains the same number of valence electrons?

Important Questions on Periodic Classification of Elements

MEDIUM
10th Manipur Board
IMPORTANT
Science for Class 10>Chapter 1 - Periodic Classification of Elements>Activity 1.2
Do the elements present in the 2nd and 3rd period of the periodic table contain the same number of shells? 
HARD
10th Manipur Board
IMPORTANT
Science for Class 10>Chapter 1 - Periodic Classification of Elements>Activity 1.3
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? 
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?