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.

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Solution

(a) The horizontal rows in the periodic table are called periods.

(b) On moving across a period (right to left) in the periodic table, the atomic size of an atom increases.

(c) On moving from right to left in the second period, the number of valence electrons decreases.

(d) On moving down in a group of the periodic table, the metallic character of elements increases.

(e) The tendency to gain an electron decreases on moving down in a group of the periodic table.

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Similar questions

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 the periodic table, the atomic size of the atom .............

(d) When we 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.

Q. What changes occur in the following on going from left to right in a period of the Periodic Table?
(i) Atomic size
(ii) Metallic character
(iii) Number of valence electrons

Q. Assertion :Atomic size decreases across period but increases down a group of the periodic table. Reason: Moving from left to right across a period, electrons are added one at a time to the outer energy shell. Electrons within a shell cannot shield each other from the attraction to protons, while moving down a group in the periodic table, the number of electrons and filled electron shells increases.

Write the number of periods the modern periodic table has. How do the valency and metallic character of elements vary on moving from left to right in a period? How do the valency and atomic size of elements vary down a group?

Q. Fill in the blanks in the following statements :
In going across a period (right to left) in periodic table, the atomic size of the atom .......

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