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How do you calculate the valency of an e...

How do you calculate the valency of an element from its electronic configuration?

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The valency of an element is determined by the number of valence electrons present in the outermost shell of its atom. The number of electrons lost or gained (or shared) by one atom of an element to achieve the nearest inert gas electron configuration, gives us the valency of the element.
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(a) How is the valency of an element determined if its electronic configuration is known? Determine the valency of an element of atomic no. 9 (b) Given below are some elements of the Modern Periodic Table. Atomic numbers of the elements are given in the parentheses: A(4), B(9), C(14), D(19), E(20) (i) With the help of the electronic configuration, find out which one of the above elements will have one electron in its outermost shell? (ii) Which rwo elements belong to the same group? Give reasons for your answer. (iii) Which one of the above elements belonging to the fourth period has bigger atomic radius and why?.

Find the odd element from the given electronic configuration.

What do you understand by the term electronic configuration of an element ? Write down the electronic configuration of oxygen (At No. = 8).

How are the group number and period number of an element in the periodic table determined from the electronic configuration of the element ?

Electronic Configuration Of Elements

The valence shell electronic configuration of Cr^(2+) ion is

VK GLOBAL PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS -LONG ANSWER QUESTIONS
  1. How do you calculate the valency of an element from its electronic con...

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  2. What is the valency of magnesium with atomic number 12 and sulphur wit...

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  3. How does the valency vary in a period on going from left to right?

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  4. How does the valency vary in going down a group?

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  5. An element is placed in 2^("nd") group and 3^("rd") period of the peri...

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  6. Atomic number of few elements are given below 10, 20, 7, 14 (a) Iden...

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  7. Mendeleev predicted the existence of certain elements not known at tha...

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  8. An element X which is a yellow solid at room temperature shows catenat...

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  9. An element X of group 15 exists as diatomic molecule and combines with...

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  10. Give an account of the process adopted by Mendeleev for the classifica...

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  11. The atomic number of an element ‘X' is 19. (a) Write its electron...

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  12. (a) How does the atomic radius change as you go (i) from left to righ...

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  13. (a) How would the tendency to lose electrons change as you go (i) fro...

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  14. The position of eight elements in the Modern Periodic Table is given b...

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  15. Atoms of eight elements A, B, C, D, E, F, G and H have the same number...

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  16. Atoms of seven elements A, B, C, D, E, F and G have a different number...

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  17. In the following table, six elements A, B, C, D, E and F of the modern...

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