Match the following columns Column I Column II (i) Eka-boron (a)Henry Moseley (ii) Modern periodic table (b)Long period (iii) Seventh period (c) 2 n 2 (iv) Maximum number of electron in a shell (d)Scandium

(i) Eka-boron- Scandium It is one of the predicted elements in Mendeleev's periodic table which is after invention name as scandium. (ii) Modern periodic table- Henry Moseley Henry Moseley in 1913 showed that the atomic number of an element is a better fundamental property for the Modern periodic table. (iii) Seventh period- Long period Modern periodic table has 18 vertical columns called groups and 7 horizontal rows, known as periods. It consists of element whose properties have not been studied properly yet. this period has 32 elements. (iv) Maximum number of electron in a shell- 2 n 2 Maximum number of electrons that can be accommodated in a shell is given by the formula 2 n 2 . where n is called as shell number. Hence, the correct match is Column I Column II (i) Eka-boron Scandium (ii) Modern periodic table Henry Moseley (iii) Seventh period Long period (iv) Maximum number of electron in a shell 2 n 2

Match the following columns. Column I Column II (i)Valency (a) Increases in group decrease in the period (ii) Atomic size (b) Decreases in group increases in the period (iii) Non-metallic properties (c) Same in group increases in the period (iv) Electronegativity (d) Decreases in group increases in the period

(i) Valency- Same in group increases in period. Valency depends upon the number of valence electrons( The electrons present in the outermost shell of its atom). The valency of oxygen is 2 . (ii) Atomic size- Increases in the group, decreases in the period.Atomic size gradually decreases from left to right across the period of elements. This is because the effective nuclear charge increases due to the increasing atomic number. Hence, nucleus will pull electrons more effectively, as we move along the period. (iii) Non-metallic properties- Decreases in group increases in the period. Non- metals are the elements that have a tendency to gain one or more electrons to form negative ions. Thus, these are electronegative elements. (iv) Electronegativity- Decreases in group increases in the period. As we, move down the group on the periodic table, the electronegativity of an element decreases because the non-metallic character decreases down the group and electronegativity increases along the period due to increase in non-metallic character. Column I Column II (i)Valency Same in group increases in the period (ii) Atomic size Increases in group decrease in the period (iii) Non-metallic properties Decreases in group increases in the period (iv) Electronegativity Decreases in group increases in the period

E M B I B E

All In One ICSE Chemistry>Chapter 5 - The Periodic Table>CHAPTER EXERCISE>Q 9

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IMPORTANT

Earn 100

Which one of the following depicts the correct representation of atomic radius (r) of an atom?

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Important Questions on The Periodic Table

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9th ICSE

IMPORTANT

All In One ICSE Chemistry>Chapter 5 - The Periodic Table>CHAPTER EXERCISE>Q 10

Match the following columns

Column I	Column II
(i) Eka-boron	(a)Henry Moseley
(ii) Modern periodic table	(b)Long period
(iii) Seventh period	(c) $2 n^{2}$
(iv) Maximum number of electron in a shell	(d)Scandium

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9th ICSE

IMPORTANT

All In One ICSE Chemistry>Chapter 5 - The Periodic Table>CHAPTER EXERCISE>Q 11

Match the following columns.

Column I	Column II
(i)Valency	(a) Increases in group decrease in the period
(ii) Atomic size	(b) Decreases in group increases in the period
(iii) Non-metallic properties	(c) Same in group increases in the period
(iv) Electronegativity	(d) Decreases in group increases in the period