NCERT Solution for Class 10 Science Chapter 5
Periodic Classification of Elements
NCERT Books for Session 2020-2021
CBSE Board and UP Board
Intext Questions
Page No-90
Questions No-2
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
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Calcium (Ca) and strontium (Sr) are expected to show chemical reactions similar to magnesium (Mg). This is because the number of valence electrons (2) is same in all these three elements. And since chemical properties are due to valence electrons, they show same chemical reactions.
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Ca and Sr
They are in the same group having same valency.
Be and Ca
Be, Mg, Ca and Sr all have same chemical property as they are in the same group.
Beryllium and Calcium. These elements show chemical reactions similar to magnesium because magnesium, calcium and beryllium belong to same group, i.e. Group 2nd in the Modern Periodic Table.