Questions: 13. Identify which: a. The most reactive element in group 2 b. The most reactive element in group 16 c. The smallest element in period 4 d. The second-most reactive element in group 15 e. The most electronegative element f. The most metallic element

13. Identify which:
a. The most reactive element in group 2
b. The most reactive element in group 16
c. The smallest element in period 4
d. The second-most reactive element in group 15
e. The most electronegative element
f. The most metallic element

Transcript text: 13. Identify which: a. The most reactive element in group 2 b. The most reactive element in group 16 c. The smallest element in period 4 d. The second-most reactive element in group 15 e. The most electronegative element f. The most metallic element

Solution

Solution Steps

Step 1: Identify the Most Reactive Element in Group 2

Group 2 elements are the alkaline earth metals, which include beryllium, magnesium, calcium, strontium, barium, and radium. Reactivity in group 2 increases as you move down the group due to the increasing atomic size and decreasing ionization energy. Therefore, the most reactive element in group 2 is radium.

Step 2: Identify the Most Reactive Element in Group 16

Group 16 elements are the chalcogens, which include oxygen, sulfur, selenium, tellurium, and polonium. Reactivity in group 16 generally decreases as you move down the group. Oxygen is the most reactive element in group 16 due to its high electronegativity and ability to form strong bonds.

Step 3: Identify the Smallest Element in Period 4

Period 4 elements include potassium, calcium, scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, gallium, germanium, arsenic, selenium, bromine, and krypton. Atomic size decreases across a period from left to right due to increasing nuclear charge. Therefore, the smallest element in period 4 is krypton.