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The elements Be, Mg, and 20Ca each havin...

The elements Be, Mg, and 20Ca each having two valence electrons in their valence shells are in periods 2, 3, and 4 respectively of the Modern Periodic Table. Answer the following questions associated with these elements, giving reason in each case.
a] In which group should they be?
b] Which one of these is least reactive?
c] Which one of them has the largest atomic size?

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a) Since `""^(4)Be, ""^(12)Mg, and ""^(20)Ca` have two valence electrons, they should be in the second group.
b] Since chemical reactivity increases down a group. `""^(4)Be` is least reactive.
c] `""^(20)Ca` has the largest atomic size since atomic size increases as we move down a group.
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ZEN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-ZEE ADDITIONAL QUESTIONS SECTIONS (SHORT ANSWER (SA) TYPE QUESTIONS)
  1. What is the basis of the Modern Periodic Table? Why lithium with atomi...

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  2. a] Mention the relative position of metals, non-metals, and metalloids...

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  3. The elements Be, Mg, and 20Ca each having two valence electrons in the...

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  4. Based on the group valency of elements state the formula for the follo...

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  5. State three reasons for placing chlorine and bromine in the same group...

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  6. Atoms of seven elements A, B, C, D, E, F, and Ghave different number o...

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  7. The positions of A, B, C, D, E, F, and in the Modern Periodic Table ar...

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  8. Consider the part of the periodic table given below and answer the fol...

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  9. An element Y has three shells with four electrons in the valence shell...

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  10. Lithium is an alkali metal with atomic number = 3 and number of valenc...

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  11. An element X (atomic number 17) reacts with an element Y (atomic numbe...

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  12. An element P (atomic number 20) reacts with an element Q (atomic numbe...

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  13. Arrange giving reason the following elements in the increasing order o...

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  14. The electrons in the atoms of four elements A, B, C, and D are distrib...

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  15. Justify the following statements: a) Cations are smaller in size th...

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  16. Give reasons for the following: a] Metals have a tendency to form ca...

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  17. Given below are some elements of the Modern Periodic Table: ""(4)Be,...

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  18. An element M with electronic configuration (2,8, 2) combines separatel...

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  19. Na, Mg, and Al are the elements of the 3rd period of the Modern Period...

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  20. An element 'X' belongs to the 3rd period and group 16 of the Modern Pe...

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