Question

1. sketch in the \stairstep\ line that separates the metals from the nonmetals on the periodic table.
2. classify each of the following elements according to the categories of elements identified in question 1:

a. lithium
b. plutonium
c. argon
d. tungsten
e. indium
f. calcium
g. lead
h. copper
i. iodine
h. gadolinium

Explanation:

• Lithium: Group 1 alkali metal.
• Plutonium: Radioactive actinide metal.
• Argon: Group 18 noble gas.
• Tungsten: Transition metal (hard, high - melting point).
• Indium: Post - transition metal.
• Calcium: Group 2 alkaline earth metal.
• Lead: Post - transition metal.
• Copper: Transition metal (good conductor).
• Iodine: Halogen (non - metal in Group 17).
• Gadolinium: Lanthanide metal.

Answer:

a. Alkali metal
b. Radioactive metal (actinide)
c. Noble gas
d. Transition metal
e. Post - transition metal
f. Alkaline earth metal
g. Post - transition metal
h. Transition metal
i. Halogen (non - metal)
j. Lanthanide metal