Question

for each list, place elements in order of least to greatest electronegativity: 1) cl chlorine na sodium si silicon 2) in indium ga gallium b boron 3) na sodium o oxygen si silicon

Explanation:

Step1: Recall electronegativity trend

Electronegativity increases across a period and decreases down a group in the periodic table.

Step2: Analyze first set (Cl, Na, Si)

Na is a metal on the left - side of the periodic table, Si is a metalloid, and Cl is a non - metal on the right - side. So the order is Na < Si < Cl.

Step3: Analyze second set (In, Ga, B)

B is in period 2, Ga in period 4, and In in period 5 of group 13. As we go down the group, electronegativity decreases. So the order is In < Ga < B.

Step4: Analyze third set (Na, O, Si)

Na is a metal, Si is a metalloid, and O is a non - metal. O is in period 2, Si in period 3 and Na in period 3. So the order is Na < Si < O.

Answer:

1. Na, Si, Cl
2. In, Ga, B
3. Na, Si, O