Question

for each element, identify the charge of its most common ion.
i
○ +3
○ -2
○ +1
○ -3
○ -1
○ +2
rb
○ +2
○ -2
○ +1
○ -3
○ -1
○ +3
o
○ +1
○ -2
○ +3
○ -3
○ -1
○ +2
al
○ +1
○ -2
○ +2
○ -3
○ -1
○ +3
© macmillan learning

Explanation:

For element I (Iodine):

Step1: Recall iodine's ion

Iodine is a halogen (Group 17). Halogens typically gain 1 electron to achieve a stable octet, forming an ion with a -1 charge.

Step2: Match with options

Among the options for I, the -1 charge is present. So the most common ion charge for I is -1.

For element Rb (Rubidium):

Step1: Recall rubidium's group

Rubidium is in Group 1 (alkali metals). Alkali metals lose 1 electron to form ions with a +1 charge.

Step2: Match with options

Among Rb's options, +1 is the correct charge for its most common ion.

For element O (Oxygen):

Step1: Recall oxygen's ion

Oxygen is in Group 16. It typically gains 2 electrons to achieve a stable octet, forming an ion with a -2 charge.

Step2: Match with options

Among O's options, -2 is the correct charge for its most common ion.

For element Al (Aluminum):

Answer:

s:

• I: -1
• Rb: +1
• O: -2
• Al: +3