Question

exit ticket 6 (module 5 - lesson 2)
question 3. using the periodic trends in electronegativity, arrange the following elements in order from least electronegative to most electronegative. drag and drop each element into the correct sequence.
silicon (si)
lithium (li)
nitrogen (n)
bromine (br)
potassium (k)

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 Each Element's Position

• Potassium (K): Group 1, Period 4. Alkali metal, low electronegativity.
• Lithium (Li): Group 1, Period 2. Higher than K (same group, higher period).
• Silicon (Si): Group 14, Period 3. Non - metal, higher than Li (across period).
• Nitrogen (N): Group 15, Period 2. Higher than Si (across period, higher group).
• Bromine (Br): Group 17, Period 4. Halogen, high electronegativity (higher than N? Wait, N is Period 2, Br is Period 4. Wait, correction: Electronegativity trend: For non - metals, across period (left - right) increases, down group (top - bottom) decreases. Let's use Pauling electronegativity values: K≈0.8, Li≈1.0, Si≈1.8, N≈3.0, Br≈2.8. Wait, no, Br is 2.8, N is 3.0. So order from least to most: K (0.8) < Li (1.0) < Si (1.8) < Br (2.8) < N (3.0)? Wait, no, wait Pauling values: K:0.82, Li:0.98, Si:1.90, Br:2.96, N:3.04. So correct order: K (least) → Li → Si → Br → N (most). Wait, but let's re - check the groups and periods. K is in Group 1, Period 4; Li is Group 1, Period 2 (so Li is above K, more electronegative than K). Si is Group 14, Period 3; N is Group 15, Period 2; Br is Group 17, Period 4. So across period 2: Li (Group 1) < N (Group 15). Across period 3: Li is Period 2, Si is Period 3, Group 14. Down Group 1: K (Period 4) < Li (Period 2). Down Group 17: Br (Period 4) is below Cl (Period 3), but N is Period 2, Group 15. So the correct order from least electronegative to most is: Potassium (K) < Lithium (Li) < Silicon (Si) < Bromine (Br) < Nitrogen (N).

Answer:

The order from least electronegative to most electronegative is: Potassium (K), Lithium (Li), Silicon (Si), Bromine (Br), Nitrogen (N)