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From the elements: Cl, Br, F, O, Al, C, Li, Cs and Xe; choose the following: 

(a) The element with highest negative electron gain enthalpy. 

(b) The element with lowest ionization enthalpy. 

(c) The element with smallest ionic radius. 

(d) The element with six electrons in the valence shell. 

(e) The element which is a liquid at room temperature. 

(f)The element which belongs to zero group. 

(g) The elements which forms largest number of compounds. 

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(a). The element chlorine (Cl) has the highest negative electron gain enthalpy. 

(b). The element cesium (Cs) has lowest ionization enthalpy. 

(c). The element fluorine F has lowest atomic radius. 

(d). The element oxygen (O) has 6 electrons in the valance shell. 

(e). The element bromine (Br) is a liquid at room temperature. 

(f). The element xenon (Xe) belongs to zero group (or group 18). 

(g). The element carbon (C) forms the largest number of compounds. 

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