Question

question 35 (1 point)
in which of the following groups of ions are the charges all shown correctly?
o a k²-, f-, mg²+
o b na+, i-, rb-
o c li-, o²-, s²+
o d ca²+, al³+, br-

question 36 (1 point)
what is the element with the lowest electronegativity value?
o a fluorine
o b cesium
o c helium
o d calcium

question 37 (1 point)
what is the element with the highest electronegativity value?
o a cesium
o b calcium
o c fluorine
o d helium

Explanation:

Question 35

• For option a: The correct charge of \(K\) ion is \(K^{+}\), not \(K^{2 -}\).
• For option b: The correct charge of \(Rb\) ion is \(Rb^{+}\), not \(Rb^{-}\).
• For option c: The correct charge of \(Li\) ion is \(Li^{+}\), not \(Li^{-}\); the correct charge of \(S\) ion is \(S^{2 -}\), not \(S^{2+}\).
• For option d: \(Ca^{2+}\), \(Al^{3+}\), and \(Br^{-}\) all have the correct charges.

• Fluorine (\(F\)) is a highly electronegative element.
• Cesium (\(Cs\)) is an alkali metal. In the periodic table, electronegativity generally decreases down a group. Alkali metals have relatively low electronegativity, and \(Cs\) is towards the bottom of the alkali - metal group.
• Helium (\(He\)) is a noble gas. Noble gases (except for some heavier noble gases in certain compounds) have a stable electron configuration and do not tend to gain or lose electrons in the same way as other elements, and we usually do not consider their electronegativity in the same context as non - noble gas elements for this kind of comparison.
• Calcium (\(Ca\)) is a metal, but it is more electronegative than \(Cs\) as it is to the right of \(Cs\) in the periodic table.

• Cesium (\(Cs\)) has a low electronegativity as it is an alkali metal.
• Calcium (\(Ca\)) is a metal with a lower electronegativity than non - metals.
• Fluorine (\(F\)) is the most electronegative element. It has a strong tendency to attract electrons due to its small atomic radius and high nuclear charge.
• Helium (\(He\)) is a noble gas. Noble gases (except for some heavier noble gases in certain compounds) have a stable electron configuration and do not tend to gain or lose electrons in the same way as other elements, and we usually do not consider their electronegativity in the same context as non - noble gas elements for this kind of comparison.

Answer:

d. \(Ca^{2+},Al^{3+},Br^{-}\)

Question 36