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An element A reacts with oxygen to form ...

An element A reacts with oxygen to form A2O. 
i] State the number of electrons in the outermost orbit of A.
ii] To which group of the periodic table does A belong?
iii] State whether A is a metal or a non-metal.

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i] Given that element A reacts with oxygen to form AO it means that two atoms of A react with one atom of oxygen and hence, A has a valency of I.
ii] It belongs to the first group of the periodic table since it has a valency of I.
 iii] A is a metal.
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ZEN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-ZEE ADDITIONAL QUESTIONS SECTIONS (SHORT ANSWER (SA) TYPE QUESTIONS)
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  3. An element P (atomic number 20) reacts with an element Q (atomic numbe...

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

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

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

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

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

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

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

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  12. An element A reacts with oxygen to form A2O.  i] State the number of...

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  13. An element has same number of electrons in I and IV shells and in the ...

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  14. i] An element X has both K and L shells completely filled with electro...

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  15. From the part of the periodic table answer the following questions. ...

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  16. An element X placed in 2nd group and 4th period of periodic table burn...

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  17. The position of three elements A, B and C in the periodic table is sho...

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  18. An element X has mass number 35 and number of neutrons = 18. Write ato...

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  19. Observe the given table and question: answer the following {:("Elem...

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