HARD
10th CBSE
IMPORTANT
Earn 100

An element 'X' has mass number 35 and number of neutrons 18. Write the electronic configuration of 'X' also. Also, write the group number, period number and valency of X.

Important Questions on Periodic Classification of Elements

HARD
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>SELF-EVALUATION TEST>Q 2

Answer the following with reason:

Which element is more metallic: Na or Cl?

HARD
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>SELF-EVALUATION TEST>Q 2

Answer the following with reason:

Which element has smaller size: O or F?

MEDIUM
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>SELF-EVALUATION TEST>Q 3
What are Dobereiner's Triads? Explain giving one example.
HARD
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>SELF-EVALUATION TEST>Q 4
Arrange the elements of group 17 according to increasing order of non-metallic character.
HARD
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>SELF-EVALUATION TEST>Q 4
Arrange the elements of group 17 according to decreasing order of electronegativity.
HARD
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>SELF-EVALUATION TEST>Q 4
Group 17 elements form negative ions. Why?
HARD
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>SELF-EVALUATION TEST>Q 5
An element P (atomic number 20) reacts with an element Q (atomic number 17) to form a compound. Answer the following question giving reason: 
Write the position of P and Q in the modern Periodic Table.
HARD
10th CBSE
IMPORTANT
New Millenium Science - Chemistry Class X>Chapter 5 - Periodic Classification of Elements>SELF-EVALUATION TEST>Q 5

An element P (atomic number 20) reacts with an element Q (atomic number 17) to form a compound. Answer the following question giving reason: 

The molecular formula of the compound formed when P reacts with Q.