Write the distribution of electrons in an atom of an element whose atomic number is 18. What is special about the outermost electron shell (or valence shell) of the atom of this element?

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Solution

Its electronic configuration is 2, 8, 8 in the shells of K, L and M respectively. The signioficance of it's outermost shell is that it is full of electrons and so, it is a noble gas and is unreactive and will not form a charged particle.

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Q. Write the distribution of electrons in an atom of element whose atomic number is 18. What is special about the outermost electron shell (or valence shell) of the atom of this element?

The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.

(a) What are valence electrons? Where are valence electrons situated in an atom ?

(b) What is the number of valence electrons in the atoms of an element having atomic number 13 ? Name the valence shell of this atom.

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