Fill in the blanks-i There are groups and periods in the modern form of periodic table-ii Most electropositive elements belong toiii Most electronegative elements belong toiv Energy released when electron is added to a neutral gaseous atom is calledv Size of the atoms from left to right across a period andvi The maximum electronegativity is shown byvii Noble gases have electron affinity-

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Standard X

Chemistry

Characteristics of s- Block Elements

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Question

Fill in the blanks:
(i) There are ____ groups and periods in the modern form of periodic table.
(ii) Most electropositive elements belong to _ group.
(iii) Most electronegative elements belong to group.
(iv) Energy released when electron is added to a neutral gaseous atom is called .
(v) Size of the atoms from left to right across a period and _ on descending in a group of normal elements.
(vi) The maximum electronegativity is shown by _.
(vii) Noble gases have ______ electron affinity.

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Solution

(i) There are 18 groups and 7 periods in the modern form of periodic table.
(ii) Most electropositive elements belong to the first group.
(iii) Most electronegative elements belong to the seventeenth group.
(iv) Energy released when electron is added to a neutral gaseous atom is called electron affinity.
(v) Size of the atoms decreases from left to right across a period and increases on descending in a group of normal elements.
(vi) The maximum electronegativity is shown by fluorine.
(vii) Noble gases have zero electron affinity.

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Q. Question 48 (a)
(a) Electropositive nature of the element(s) increases down the group and decreases across the period
(b) Electronegativity of the element decreases down the group and increases across the period
(c) Atomic size increases down the group and decreases across a period (left to right)
(d) Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.

Name the most electropositive element among them

(i) Electropositive nature of the element(s) increases down the group and decreases across the period
(ii) Electronegativity of the element decreases down the group and increases across the period
(iii) Atomic size increases down the group and decreases across a period (left to right)
(iv) Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.

Which is the most electronegative element?

Q. Question 48 (b)
(a) Electropositive nature of the element(s) increases down the group and decreases across the period
(b) Electronegativity of the element decreases down the group and increases across the period
(c) Atomic size increases down the group and decreases across a period (left to right)
(d) Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.

Name the most electronegative element.

Q. While going from right to left across a period in the modern periodic table, the electronegativity of elements:

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