Which of the following statements are true about electronegativity?
(i) Electronegativity generally increases across a period and decreases down a group.
(ii) The electronegativity of a given element is constant.
(iii) The electronegativity values decrease with the increase in atomic radii.
(iv) Electronegativity is directly related to the metallic property of the elements.
(v) Electronegativity is inversely related to the non-metallic property of the elements.