Reference to the long form of the periodic table fills in the blanks with appropriate words.
--------- elements are placed on the right-hand side of the periodic table.

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Solution

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 are 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.
Non-metals are the elements on the right-hand side of the periodic table that is from groups 13 to 18.
The 17 non-metal elements are hydrogen, helium, carbon, nitrogen, oxygen, fluorine, neon, phosphorus, sulfur, chlorine, argon, selenium, bromine, krypton, iodine, xenon, and radon.
Non-metallic elements are placed on the right-hand side of the periodic table.

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Q. Fill in the blanks in the following statements:

(a) The horizontal rows in a periodic table are called ...............
(b) In going across a period (right to left) in periodic table, the atomic size of the atom ...............
(c) On moving form right to left in the second period, the number of valency electrons ...............
(d) On going down in a group in the periodic table, the metallic character of elements ...............
(e) The tendency to gain an electron ............... on moving down in a group of the periodic table.

Fill in the following blanks with suitable words :

(a) The basis for the modern periodic table is ……………

(b) The horizontal rows in a periodic table are called ……………

(d) Group 17 elements are known as ……………

(e) Group 18 elements are called ……………

(f) According to Newland’s classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the …………… element starting from oxygen.

With reference to the long form of the periodic table fill in the blanks with appropriate words.

______metals and alkaline______metals are placed in group 1A and 2A respectively on the left-hand side of the periodic table.

Reference to the long form of the periodic table fills in the blanks with appropriate words.

The second and the third period have -------- elements and are called --------- periods.

Reference to the long form of the periodic table fills in the blanks with appropriate words.

The chemical properties of an element are the periodic function of their --------.

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Reference to the long form of the periodic table fills in the blanks with appropriate words.--------- elements are placed on the right-hand side of the periodic table.

Reference to the long form of the periodic table fills in the blanks with appropriate words.
--------- elements are placed on the right-hand side of the periodic table.