Question

question 5. list the elements from least to greatest electronegativity.
a) phosphorus (p), gallium (ga), arsenic (as)
answer:

b) beryllium (be), cesium (cs), oxygen (o)
answer:

:: phosphorus (p)
:: gallium (ga)
:: arsenic (as)
:: beryllium (be)
:: cesium (cs)
:: oxygen (o)

Explanation:

Step1: Recall Electronegativity Trends

Electronegativity increases across a period (left to right) and decreases down a group (top to bottom) in the periodic table.

Step2: Analyze Part (a) Elements

• Gallium (Ga): Group 13, Period 4.
• Phosphorus (P): Group 15, Period 3.
• Arsenic (As): Group 15, Period 4.

• Compare Ga and As: Same period (4), As is to the right of Ga, so As > Ga.
• Compare P and As: Same group (15), P is above As, so P > As.
• Order: Ga < As < P.

Step3: Analyze Part (b) Elements

• Cesium (Cs): Group 1, Period 6.
• Beryllium (Be): Group 2, Period 2.
• Oxygen (O): Group 16, Period 2.

• Compare Be and O: Same period (2), O is to the right of Be, so O > Be.
• Compare Be and Cs: Same group (alkaline earth/alkali), Cs is below Be, so Be > Cs.
• Order: Cs < Be < O.

Answer:

a) Gallium (Ga), Arsenic (As), Phosphorus (P)
b) Cesium (Cs), Beryllium (Be), Oxygen (O)