10-minute Quiz : Chapter 47

Which of the following properties of elements would increase when moving across Period 3 of the Periodic Table?

• A. The number of protons in their atoms
• B. The number of electron shells occupied by the electrons in their atoms
• C. The magnitude of charges carried by their simple ions (except for silicon and argon)
• D. The metallic character exhibited by them

The elements are arranged in periods and groups in the Periodic Table. This arrangement allows scientists to predict the physical and chemical properties of undiscovered elements. Which of the following statements correctly explains why such predictions are possible?

• A. The elements within the same period display similar properties.
• B. The elements within the same group display similar properties.
• C. The elements show trends in properties across each period and down each group.
• D. The unknown elements were filled in the Periodic Table according to their predicted properties.

Refer to the information as shown. Which of these elements belong to the same period?

• A. P and Q

• B. Q and R

• C. P and R

• D. P, Q and R

Which of the following comparisons in the metallic character of some elements in the second and third periods of the Periodic Table is/are correct?

(1) Carbon is more metallic than beryllium.

(2) Magnesium is more metallic than silicon.

(3) Sodium is less metallic than aluminium.

• A. (1) only
• B. (2) only
• C. (1) and (3) only
• D. (2) and (3) only

Which of the graphs (not drawn to scale) correctly sketches the variation in melting points of four of the elements, magnesium, aluminium, silicon and phosphorus, in the third period of the Periodic Table?

• A
• B
• C
• D

Which of the following statements correctly explains why magnesium has a higher electrical conductivity than sodium?

• A. Magnesium has a higher electronegativity than sodium.
• B. Magnesium has a higher relative atomic mass than sodium.
• C. Magnesium has more protons than sodium in each atom.
• D. Magnesium has more delocalized electrons than sodium in the structure.

Compound X is made up of two of the Period 3 elements. One of them has the highest melting point, while the other one has the lowest in that period. Given that X is not composed of argon, which of the following may be the formula of X?

• A. AlCl₃
• B. Al₂S₃
• C. SiCl₄
• D. SiS₂

Given that the melting points of phosphorus, sulphur and chlorine decrease in the following order:

sulphur > phosphorus > chlorine

Which of the following types of electrostatic attraction mainly influence the melting points of these elements?

• A. Van der Waals’ forces
• B. Hydrogen bonds
• C. Covalent bonds
• D. Ionic bonds

Which of the following statements concerning the electrical conductivity of the elements in the third period of the Periodic Table at room temperature is/are correct?

(1) Aluminium has the highest electrical conductivity among all the elements.

(2) Silicon has a higher electrical conductivity than sulphur.

(3) Chlorine has a higher electrical conductivity than argon.

• A. (1) only
• B. (2) only
• C. (1) and (3) only
• D. (2) and (3) only

The graph sketches (not drawn to scale) the periodic variation in one property of elements from lithium (with atomic number 3) to argon (with atomic number 18). What property of these elements is likely to be sketched?

• A. Density
• B. Melting point
• C. Electrical conductivity
• D. Atomic size