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Chapter 22: Problem 12

Identify each of the following elements as a metal, non metal, or metalloid: (a) gallium, (b) molybdenum, (c) tellurium, ( \(\mathbf{d}\) ) arsenic, (e) xenon, (f) ruthenium.

Short Answer

Expert verified
(a) Gallium is a metal, (b) Molybdenum is a metal, (c) Tellurium is a metalloid, (d) Arsenic is a metalloid, (e) Xenon is a non-metal, and (f) Ruthenium is a metal.

Step by step solution

01

(a) Gallium

Gallium, with symbol Ga and atomic number 31, is a metal. It is found in group 13 (also known as group IIIA) in the periodic table, and all elements in this group are metals. Therefore, gallium is a metal.
02

(b) Molybdenum

Molybdenum, with symbol Mo and atomic number 42, is a metal. It is found in group 6 (also known as group VIB) in the periodic table, which mainly consists of transition metals. Therefore, molybdenum is a metal.
03

(c) Tellurium

Tellurium, with symbol Te and atomic number 52, is a metalloid. It is found in group 16 (also known as group VIA) in the periodic table, adjacent to the metalloid line dividing metals and non-metals. The elements in this group show properties which are intermediate between metals and non-metals, classifying tellurium as a metalloid.
04

(d) Arsenic

Arsenic, with symbol As and atomic number 33, is a metalloid. It is found in group 15 (also known as group VA) in the periodic table, adjacent to the metalloid line dividing metals and non-metals. The elements in this group show properties which are intermediate between metals and non-metals, classifying arsenic as a metalloid.
05

(e) Xenon

Xenon, with symbol Xe and atomic number 54, is a non-metal. It is found in group 18 (also known as group VIIIA) in the periodic table, which are noble gases. The noble gases are non-metals, and therefore, xenon is a non-metal.
06

(f) Ruthenium

Ruthenium, with symbol Ru and atomic number 44, is a metal. It is found in group 8 (also known as group VIIIB) in the periodic table, which mainly consists of transition metals. Therefore, ruthenium is a metal.

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