How does the number of valence electrons vary on moving from left to right :

(i) in the first period of the periodic table ? (ii) in the second period of the periodic table ?

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Solution

ANSWER:
i) In the first period of the periodic table, the number of valence electrons increases from 1 to 2, on moving from left to right.

ii) In the second period of the periodic table, the number of valence electrons increases from 1 to 8 on moving from left to right.

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Similar questions

Q. How does number of valence electrons vary on moving from left to right in the second period of a periodic table ?

Q. Write the number of periods and groups in the Modern Periodic Table. How does the metallic character of the elements vary on moving (i) from left to right in a period, and (ii) down a group ? Give reason to justify your answer.

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

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?

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.

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How does the number of valence electrons vary on moving from left to right : (i) in the first period of the periodic table ? (ii) in the second period of the periodic table ?

ANSWER: i) In the first period of the periodic table, the number of valence electrons increases from 1 to 2, on moving from left to right. ii) In the second period of the periodic table, the number of valence electrons increases from 1 to 8 on moving from left to right.

How does the number of valence electrons vary on moving from left to right :

(i) in the first period of the periodic table ? (ii) in the second period of the periodic table ?

ANSWER:
i) In the first period of the periodic table, the number of valence electrons increases from 1 to 2, on moving from left to right.

ii) In the second period of the periodic table, the number of valence electrons increases from 1 to 8 on moving from left to right.