Question

$main \: charecteristics \: of \: representative \\ \: elements \: explain \: i t$
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Answer 1

Answer:

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Explanation:

The modern periodic table is classified into 4 types:

• representative elements --- group 1,2 ,13-17
• transition elements ---- group 3-12
• inner transition elements ---- group 3 and
• period 6 and 7 (lanthanides and actinides)

noble gases ----- group 18

• The three main characteristics of representative elements are:

they consists of both metals and non-metals.

They form electrovalent/ionic as well as covalent compounds.

Metals in group 1 and 2 are good conductors of electricity.

non-metals in group 16 and 17 are poor conductors of electricity.

Few elements are heavier, like tin and lead which exhibit variable valency.

Metallic character increases while moving down in all the seven groups.

The physical state of last group that is noble gases is gases.

• They are inert gases.
• They do not react with any elements.
• Their combining capacity , valency is 0.

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Answer 2

ANSWER:-

• The Periodic Table of Elements as it is known today was developed by Russian chemist Dmitri Mendeleev and first presented in the German chemistry priodical Zeitschrift f?r Chemie in 1869. Mendeleev had originally created his “Periodic System” by writing properties of the elements onto pieces of cards and arranging them in order of increasing atomic weight. Mendeleev also determined that the relative atomic mass of some elements was wrongly calculated. By correcting this, he was able to place the elements into their correct place in the table. Mendeleev also left places for elements that had not yet been discovered. As of June 2010, the periodic table contain 118 confirmed elements.
• On the periodic table of elements, columns of elements define element groups that share many common properties. There are two sets of groups in the periodic table. The first set are Group A elements and are also known as representative elements. The second set are Group B elements and are also known as transition metals. Representative elements are the most abundant elements on earth.