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PART - 1 CH - 3 Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 3 Classification of Elements and Periodicity in Properties2 Marks
Question
Use the periodic table to answer the following questions.
(a) Identify an element with five electrons in the outer subshell.
(b) Identify an element that would tend to lose two electrons.
(c) Identify an element that would tend to gain two electrons.
(d) Identify the group having metal, non-metal, liquid as well as gas at the room temperature.
✓

Answer

(a) Fluorine (F) : Electronic configuration $1 s^2$ $2 s^2 2 p^5$ or any other halogen $( Ll , Br , I )$.
(b) Mg or Ca , Electronic configuration of Mg : $1 s^2 2 s^2 2 p^6 3 s^2$. It looses two electrons and gain stable inert gas configuration.
(c) Oxygen (O) : This accept two electron and obtain stable configuration like Ne and form $O ^{-2}$ ion.
(d) $17^{\text {th }}$ group (halogens) : In this Br is liquid and $F , Cl$ are gases. $F , Cl , Br$ and I are non-metals while At is metal.

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