Question

question 4
1 point
based on their positions in the periodic table, which of the following series of elements is arranged in order of increasing electronegativity? (reference p 202 of your textbook.)
a ca, ba, v, ni, ge, br
b fr, cs, sr, rb, mg, be
c ag, cr, mn, fe, co, ni
d ba, ti, w, b, n, f
e at, te, br, cl, f, o

Explanation:

Electronegativity increases across a period from left to right and decreases down a group.

• Option A: Ba (Group 2, Period 6) has lower electronegativity than Ca (Group 2, Period 4), so this order is wrong.
• Option B: Fr (Group 1, Period 7) has lower electronegativity than Cs (Group 1, Period 6), and Rb (Group 1, Period 5) has lower electronegativity than Sr (Group 2, Period 5), so this order is wrong.
• Option C: Ag (Group 11, Period 5) has lower electronegativity than Cr (Group 6, Period 4), so this order is wrong.
• Option D: Ba (Group 2, Period 6) < Ti (Group 4, Period 4) < W (Group 6, Period 6) < B (Group 13, Period 2) < N (Group 15, Period 2) < F (Group 17, Period 2). This follows the trend of increasing electronegativity across periods and up groups.
• Option E: At (Group 17, Period 6) has lower electronegativity than Br (Group 17, Period 4), so this order is wrong.

Answer:

D. Ba, Ti, W, B, N, F