Fill in the blanks with correct option.

1. Properties of element are periodic function of their ___ (atomic mass/ atomic number/ relative atomic mass).

2. The elements having same _(electronic configuration/ number of valence electrons) are placed in the same group.

3. In the modern periodic table the elements placed below sodium are expected to have(lower/ higher) electronegativity than sodium and the elements placed above chlorine are expected to have (lower/ higher) ionization energy than chlorine.

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Q. The electronegativities (according to Pauling) of the elements in period 3 of the periodic table are as follows. The elements are arranged in alphabetical order:

Al	Cl	Mg	Na	P	S	Si
1.5	3.0	1.2	0.9	2.1	2.5	1.8

(i) Arrange the elements in the order in which they occur in the periodic table from left to right. (The group 1 elements first, followed by the group 2 element and so on, up to group 7.)
(ii) Choose the word or phrase from the brackets which correctly completes each of the following statements:
(a) The element below sodium in the same group would be expected to have a _________ (lower/higher) electronegativity than sodium and the element above chlorine which would be expected to have a ________ (lower/higher) ionization potential than chlorine.
(b) On moving from left to right in a given period, the number of shells _________ (remains the same/increases/decreases).
(c) On moving down a group, the number of valence electrons __________ (remains the same/increases/decreases).

Choose the word or phrase from the brackets which correctly completes each of the following statements:-

(a) The element below sodium in the same group would be expected to have a ........... (lower/higher) electro-negativity than sodium and the element above chlorine would be expected to have a ............. (lower/higher) ionization potential than chlorine.

(b) On moving from left to right in a given period, the number of shells ...... (remains the same/ increases decreases).

(d) Metals are good ............. (oxidising agent/ reducing agent) because they are electron.......... (acceptors/donors).

Q. Copy and complete the following sentences choosing the correct word or words from those given in the brackets, at the end of each sentence:
(1) The properties of the elements are a periodic function of their _________ (atomic number, mass number, relative atomic mass).
(2) Moving across a ________ of the periodic table, the elements show increasing _______ character (group, period, metallic, non-metallic).
(3) The element at the bottom of a group would be expected to show ________ metallic character than the element at the top (less, more).
(4) The similarities in the properties of elements belonging to a group is because they have the same _________ (electronic configurations, number of outer electrons, atomic number).

Chlorine in the Periodic Table is surrounded by the elements with atomic number 9, 16, 18 and 35.

(a) Which of these have Physical and Chemical properties resembling chlorine ?

(b) Which is more electronegative than chlorine ?

Choose the words which correctly completes the following statements:

The element below sodium in the same Group would be expected to have a (A) electronegativity than sodium and the element above chlorine would be expected to have a (B) ionization potential than chlorine.

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