Question

question 3. classify the elements below as metals, nonmetals, or metalloids. a) sodium (na) b) iodine (i) c) silicon (si) d) zinc (zn) e) krypton (kr) f) barium (ba) g) antimony (sb) h) radium (ra)

Explanation:

Step1: Recall element - type characteristics

Elements on the left - hand side and middle of the periodic table are metals, those on the right are nonmetals, and elements along the staircase line are metalloids.

Step2: Classify sodium

Sodium is in Group 1 of the periodic table, it is a metal.

Step3: Classify iodine

Iodine is a halogen in Group 17, it is a nonmetal.

Step4: Classify silicon

Silicon is along the staircase line in the periodic table, it is a metalloid.

Step5: Classify zinc

Zinc is a transition metal in Group 12, it is a metal.

Step6: Classify krypton

Krypton is a noble gas in Group 18, it is a nonmetal.

Step7: Classify barium

Barium is an alkaline - earth metal in Group 2, it is a metal.

Step8: Classify antimony

Antimony is along the staircase line in the periodic table, it is a metalloid.

Step9: Classify radium

Radium is an alkaline - earth metal in Group 2, it is a metal.

Answer:

a) Metal
b) Nonmetal
c) Metalloid
d) Metal
e) Nonmetal
f) Metal
g) Metalloid
h) Metal