64. The effective nuclear charge of an element with 3 valence electrons is 2.60. What is the atomic number of the element? D.-13.6 eV

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(a) Define valency of an element. What valency will be shown by an element having atomic number 14 ?

(b) What is the relation between the valency of an element and the number of valence electrons in its atoms ? Explain with examples.

Q. The atomic number of an element is 16. The number of valence electrons in the element is:

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(a) Valence principal quantum number (n)

(b) Nuclear charge (Z)

(d) Number of core electrons.

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