Q38E - Chemistry (OpenStax)

Question

Using the periodic table, classify each of the following elements as a metal or a nonmetal, and then further classify each as a main-group (representative) element, transition metal, or inner transition metal:

(a) cobalt 

(b) europium

(c) iodine

(d) indium

(e) lithium 

(f) oxygen

(h) cadmium 

(i) terbium 

(j) rhenium

Step-by-Step Solution

Answer

a. Metal, Transition Metal

b. Metal, Inner transition Metal

c. Non-Metal Main group element

d. Metal, Main group element

e. Metal, Main group element

f. Non-Metal Main group element

h. Metal, Transition Metal

i. Metal, Inner Transition Metal

j. Metal, Transition Metal

Step 1: Classify the cobalt, europium, and iodine.

a. Cobalt: - Using the periodic table, we have an atomic number of cobalt is \(27\) and present in \({9^{th}}\) group and \({4^{th}}\) period. So, it is metal and transition metal.

b. Europium: - Using the periodic table, we have an atomic number of cobalt is \(63\) and present in \({9^{th}}\) group and \({6^{th}}\) period. So, it is metal and transition metal.

c. Iodine: Using the periodic table, we have an atomic number of cobalt is \(53\) and present in \({17^{th}}\) group and \({5^{th}}\) period. So, it is non-metal and main group element.

Step 2: Classify the indium, lithium, and oxygen.

d. Indium: - Using the periodic table, we have an atomic number of cobalt is \(49\) and present in \({13^{th}}\) group and \({5^{th}}\) period. So, it is metal and main group element.

e. Lithium: - Using the periodic table, we have an atomic number of cobalt is \(3\) and present in \({1^{st}}\) group and \({2^{nd}}\) period. So, it is metal and main group element.

f. Oxygen: Using the periodic table, we have an atomic number of cobalt is \(8\) and present in \({16^{th}}\) group and \({2^{nd}}\) period. So, it is non-metal and main group element.

Step 3: Classify the cadmium, terbium, and rhenium.

h. Cadmium: - Using the periodic table, we have an atomic number of cobalt is \(48\) and present in \({12^{th}}\) group and \({5^{th}}\) period. So, it is metal and transition metal.

i. Terbium: - Using the periodic table, we have an atomic number of cobalt is \(65\) and present in \({11^{th}}\) group and \({6^{th}}\) period. So, it is metal and Inner transition metal.

j. Rhenium: Using the periodic table, we have an atomic number of cobalt is \(75\) and present in \({7^{th}}\) group and \({6^{th}}\) period. So, it is metal and transition metal.