Question Video: Identifying the Element That Is Not Considered a Metal | Nagwa Question Video: Identifying the Element That Is Not Considered a Metal | Nagwa

Question Video: Identifying the Element That Is Not Considered a Metal Chemistry • Second Year of Secondary School

Join Nagwa Classes

Attend live Chemistry sessions on Nagwa Classes to learn more about this topic from an expert teacher!

Which of the following is not considered a metal? [A] Silicon [B] Lithium [C] Potassium [D] Sodium [E] Cesium

02:43

Video Transcript

Which of the following is not considered a metal? (A) Silicon, (B) lithium, (C) potassium, (D) sodium, (E) cesium.

Metals have very different chemical and physical properties when compared to nonmetals. This is because the atoms of metals and nonmetals are bonded in different ways. Metallic bonding is the strong electrostatic attraction between positively charged metal cations and delocalized electrons. This bonding structure is responsible for many of the properties of metals, including that they tend to be hard, electrically conductive, malleable, ductile, and lustrous. Metals also tend to have high melting points, boiling points, and thermal conductivity.

Let’s take a look at where the metals are located on the periodic table. In the figure, metals are represented with the color pink, and they are found on the left-hand side of the periodic table. Nonmetal elements are represented with the color blue, and they are found on the right-hand side of the periodic table, except for hydrogen. The metalloids are represented with the color orange, and they can be found in between the metals and nonmetals. And finally, the elements outlined in black are elements with unknown chemical properties.

Now, let’s have a closer look at the metalloids to see if any of the answer choices fall into this category. We can see that silicon, or Si, is found in the metalloid section. On the other hand, lithium, potassium, sodium, and cesium are all metals.

Metalloids are elements that have some properties of metals and some properties of nonmetals. Silicon fits this description well because it has properties that are similar to metal elements, such as being a solid at room temperature, having luster, and having a high melting point. Silicon also has properties that are similar to those of nonmetal elements. For example, it is brittle and inductile. The electrical conductivity of silicon is somewhat like both metals and nonmetals, making it useful as a semiconductor.

In conclusion, the element that is not considered to be a metal is silicon, or answer choice (A).

Join Nagwa Classes

Attend live sessions on Nagwa Classes to boost your learning with guidance and advice from an expert teacher!

  • Interactive Sessions
  • Chat & Messaging
  • Realistic Exam Questions

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy