The elements of the second period of the Periodic Table are given below: Li Be B C N O F
(a) Atomic radii decrease from Li to F. Give reason.
(b) Identify the most metallic and non-metallic element.

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Solution

(a) It is because nuclear charge increases due to an increase in atomic number, therefore, the force of attraction between the nucleus and valence electrons increases, i.e. effective nuclear charge increases, hence atomic radii decrease from Li to F.
(b) Most metallic element is ‘Li’ as it can lose electrons easily due to larger atomic size and the most non-metallic element is ‘F’ because it can gain electrons easily due to its smallest atomic size.

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Q. For the main group of the periodic table, the metallic properties of the elements vary approximately with their position as shown in the table.

1	2	13	14	15	16	17	18
H							He
A				B
C				D

(i) Will the most metallic element be found at A, B, C or D?
(ii) Will the most non-metallic element be found at A, B, C or D?

Q. Question 44 (b)
Atomic number of a few elements are given below 10, 20, 7, 14. Identify the group number of these elements in the Periodic Table

Q. Question 44 (c)
Atomic number of a few elements are given below 10, 20, 7, 14. Identify the periods of these elements in the Periodic Table.

(a) What are the periods and groups in a periodic table? Give two characteristics of each.

(b) In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group.

$\begin{matrix} L i & B e N a K R b C s F r & R a \end{matrix}$

(i) What happens to the size of atoms?

(ii) What happens to their metallic character?

(d) Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change?

(e) Rewrite the following statement after correction, if necessary :

Groups have elements with consecutive atomic numbers.

Q. (a) What are the periods and groups in a periodic table? Give two characteristics of each.
(b) In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group.
(c) Given alongside is a part of the periodic table. As we move vertically downward from Li to Fr:

Li	Be
Na
K
Rb
Cs
Fr	Ra

(i) What happens to the size of atoms?
(ii) What happens to their metallic character?
(d) Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change?
(e) Rewrite the following statement after correction, if necessary:
Groups have elements with consecutive atomic numbers.

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The elements of the second period of the Periodic Table are given below: Li Be B C N O F (a) Atomic radii decrease from Li to F. Give reason. (b) Identify the most metallic and non-metallic element.

The elements of the second period of the Periodic Table are given below: Li Be B C N O F
(a) Atomic radii decrease from Li to F. Give reason.
(b) Identify the most metallic and non-metallic element.