Given below are the names of few elements based on their position in the periodic table. Identify the element which is not correctly placed.

An element which tends to lose three electrons - Aluminium

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An element which tends to gain two electrons - Iodine

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An element with valency four - Silicon

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A transuranium element - Plutonium

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Solution

The correct option is A An element which tends to gain two electrons - Iodine
Iodine can gain only one electron.
$I + e^{-} \to I^{-}$
Iodine has 7 valence electrons. It will complete its octet when it gains one electron.
Al has 3 valence electrons. Al loses three electrons to attain stable noble gas electronic configuration.
Silicon has four valence electrons. It shares these four electrons to complete its octet.

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Use the periodic table to answer the following questions.

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(c) Identify an element that would tend to gain two electrons.
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Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon.

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(b) Mention the period/periods of these elements in the modern periodic table.

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(e) How many valence electrons are present in the atoms of each of these elements?

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b) An element which obtains the noble gas configuration of neon by losing three electrons.
c) An element which gains two electrons to obtain the noble gas configuration of neon.
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