EASY
10th ICSE
IMPORTANT
Earn 100

LI, Na. K are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements? 

Important Questions on Periodic Classification of Elements

EASY
10th ICSE
IMPORTANT
Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 15
Ne is an unreactive gas and Ar is a gas of extremely low reactivity. Do their atoms have anything in common?
MEDIUM
10th ICSE
IMPORTANT
Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 16
How does the tendency of an atom to lose electrons varies in a period? Explain why?
MEDIUM
10th ICSE
IMPORTANT
Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 17
Write the trend of atomic size and metallic character along a group and period in the modern Periodic Table.
MEDIUM
10th ICSE
IMPORTANT
Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 18
'Elements in Periodic Table show periodicity of properties'. List any such four properties.
MEDIUM
10th ICSE
IMPORTANT
Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 19
Two elements X and Y have atomic numbers 12 and 16 respectively. Write the electronic configuration of these elements. To which period of the Modern Periodic Table do these two elements belong? What type of bond will be formed between them and why?
HARD
10th ICSE
IMPORTANT
Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 20
Atomic number is considered to be a more appropriate parameter than atomic mass for classification of elements in the periodic table. Why? How does atomic size of elements vary on moving from (a) left to right in a period (b) top to bottom in a group?
MEDIUM
10th ICSE
IMPORTANT
Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 22

The elements Be, Mg, and Ca each having two electrons in their outermost shell are in periods 2, 3. and 4 respectively of the Modern Periodic Table. Answer the following giving justification.

Write the group to which these elements belong.

MEDIUM
10th ICSE
IMPORTANT
Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 22

The elements Be, Mg, and Ca each having two electrons in their outermost shell are in periods 2, 3. and 4 respectively of the Modern Periodic Table. Answer the following giving justification.

Name the least reactive element.