Metals and Non-Metals [Part: 1]

Which of the following is a liquid metal at room temperature?

• Mercury

• Bromine

• Sodium

• Gold

Answer explanation

Mercury is the only metal that is liquid at room temperature, making it unique among the options. Bromine is a liquid non-metal, while sodium and gold are solid metals.

How many non-metals are gases at room temperature?

• 11

• 10

• 22

• 5

Answer explanation

At room temperature, there are 10 non-metals that exist as gases: hydrogen, nitrogen, oxygen, fluorine, neon, chlorine, argon, krypton, xenon, and radon. Therefore, the correct answer is 10.

In the periodic table, metals generally occupy which part?

• Right-hand side

• Left-hand side and center

• Bottom

• Top-right corner

Answer explanation

In the periodic table, metals are primarily found on the left-hand side and in the center, including groups 1-12. This distinguishes them from nonmetals, which are located on the right-hand side.

What are metalloids?

• Elements that have properties of both metals and non-metals

• Metals that can conduct electricity

• Non-metals that can conduct heat

• Highly reactive metals

Answer explanation

Metalloids are elements that exhibit characteristics of both metals and non-metals, making them unique in their properties. This distinguishes them from pure metals, non-metals, and highly reactive metals.

Which of the following elements is considered a metalloid?

• Boron

• Oxygen

• Sodium

• Calcium

Answer explanation

Boron is classified as a metalloid due to its properties that are intermediate between metals and nonmetals. In contrast, oxygen is a nonmetal, while sodium and calcium are metals.

Which of the following is a characteristic property of metals?

• Brittle

• Non-conductors of heat

• Malleable

• Low melting point

Answer explanation

Malleability is a key characteristic of metals, allowing them to be shaped without breaking. In contrast, brittleness, non-conductivity of heat, and low melting points are not typical properties of metals.

What type of bonding is typically seen in metals?

• Ionic

• Covalent

• Metallic

• Hydrogen bonding

Answer explanation

Metals typically exhibit metallic bonding, where electrons are shared freely among a lattice of metal cations. This results in properties like conductivity and malleability, distinguishing them from ionic and covalent bonds.

Which metal is known for having the highest density?

• Aluminium

• Sodium

• Mercury

• Lead

Answer explanation

Lead is known for having the highest density among the given options, with a density of about 11.34 g/cm³, making it denser than aluminium, sodium, and mercury.

Which of the following is the best conductor of electricity?

• Copper

• Silver

• Aluminium

• Lead

Answer explanation

Silver is the best conductor of electricity due to its high electrical conductivity, surpassing that of copper, aluminum, and lead. This makes it the preferred choice for applications requiring efficient electrical transmission.

Which non-metal is a good conductor of electricity?

• Graphite

• Iodine

• Sulfur

• Bromine

Answer explanation

Graphite is a non-metal that conducts electricity due to its structure, where delocalized electrons can move freely. In contrast, iodine, sulfur, and bromine do not have this property, making graphite the correct choice.