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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Solution

The element below sodium in the same Group would be expected to have a lower electronegativity than sodium and the element above chlorine would be expected to have a higher ionization potential than chlorine.

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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. 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).

Q. If out of two given elements A and B, A has a higher ionization energy than B, Which element is expected to be more electronegative A or B?

Q. A group of elements in the periodic table is given below (Boron is the first member of the group and thallium is the last.)
Boron
Aluminium
Gallium
Indium
Thallium
Answer the following questions in relation to the above group of elements:
(a) Which element has the most metallic character?
(b) Which element would be expected to have the highest electronegativity?
(c) If the electronic configuration of aluminium is 2, 8, 3, how many electrons will be there in the outermost shell of thallium?
(d) The atomic number of boron is 5. Write the chemical formula of the compound formed when boron reacts with chlorine.
(e) Will the elements in the group to the right of this boron group be more metallic or less metallic in character? Justify your answer.

Q. The HCP and CCP structure for a given element would be expected to have:

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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.

The element below sodium in the same Group would be expected to have a lower electronegativity than sodium and the element above chlorine would be expected to have a higher ionization potential 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.