NCERT Solution Class X Science Periodic Classification of Elements Question 2 (Ex 5.3)

Question 2:

Name two elements you would expect to show chemical reactions similar to

magnesium. What is the basis for your choice?

Answer:

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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