Question

1. what is true about elements as you move from left to right across a period? a. they become more metallic b. their atomic radius increases c. their electronegativity decreases d. their ionization energy generally increases 10. which group on the periodic table contains the most reactive nonmetals? a. group 1 b. group 2 c. group 17 d. group 18

Explanation:

• For question 9: As you move from left - to - right across a period, the number of protons increases, which leads to a stronger attraction between the nucleus and electrons. This results in an increase in ionization energy. Metallic character decreases, atomic radius decreases, and electronegativity increases across a period.
• For question 10: Group 17 elements (halogens) are the most reactive non - metals. They have 7 valence electrons and need only 1 more electron to achieve a stable octet. Group 1 are alkali metals, Group 2 are alkaline earth metals, and Group 18 are noble gases which are generally unreactive.

Answer:

1. D. Their ionization energy generally increases
2. C. Group 17