Question

the arrow on the periodic table above could illustrate which of the following periodic trends? i. atomic radius ii. ionization energy iii. electronegativity iv. metallic properties

Explanation:

Atomic radius decreases across a period (left - to - right) and increases down a group. Ionization energy and electronegativity increase across a period and decrease down a group. Metallic properties decrease across a period and increase down a group. The arrow shows an increasing trend from right - to - left, which is consistent with the trends of atomic radius and metallic properties.

Answer:

I, IV