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A table of a chart in which elements are arranged in periods and groups.

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Modern periodic table:
The modern periodic table is an arrangement of all the elements known in accordance with their increasing atomic number and recurring chemical properties.
It is a tabular display of 118 chemical elements which consists of horizontal rows called periods and vertical columns called groups.
All elements in a group have the same number of valance electrons, and in period elements have the same number of electron shells.
There are seven periods and eighteen groups in the modern periodic table.

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Classification in which elements are grouped into groups of three.

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The electronegativities (according to Pauling) of the elements in Period 3 of the Periodic Table asfollow with the elements arranged in alphabetical order :

$\begin{matrix} A l & C l & M g & N a & P & S & S i 1.5 & 3.0 & 1.2 & 0.9 & 2.1 & 2.5 & 1.8 \end{matrix}$

Arrange the elements in the order in which they occur in the Periodic Table from left to right.

(The group 1 element first , followed by the group 2 element and so on , up to group 7).

Q. The electronegativities (according to Pauling) of the elements in period 3 of the periodic table are as follows. The elements are arranged in alphabetical order:

Al	Cl	Mg	Na	P	S	Si
1.5	3.0	1.2	0.9	2.1	2.5	1.8

(i) Arrange the elements in the order in which they occur in the periodic table from left to right. (The group 1 elements first, followed by the group 2 element and so on, up to group 7.)
(ii) Choose the word or phrase from the brackets which correctly completes each of the following statements:
(a) The element below sodium in the same group would be expected to have a _________ (lower/higher) electronegativity than sodium and the element above chlorine which would be expected to have a ________ (lower/higher) ionization potential than chlorine.
(b) On moving from left to right in a given period, the number of shells _________ (remains the same/increases/decreases).
(c) On moving down a group, the number of valence electrons __________ (remains the same/increases/decreases).

Q. Which group of elements could be placed in Mendeleev's periodic table later on, without disturbing the order? Give reason.

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Give one-word answerA table of a chart in which elements are arranged in periods and groups.

Give one-word answer
A table of a chart in which elements are arranged in periods and groups.