The Periodic Table and Periodicity
Competition questions
24 marksThe table gives the successive ionisation energies, in kJ mol−1, of five elements in Period 3.
| element | IE1 | IE2 | IE3 | IE4 | IE5 |
|---|---|---|---|---|---|
| V | 787 | 1577 | 3231 | 4356 | 16091 |
| W | 738 | 1451 | 7733 | 10540 | 13630 |
| X | 1251 | 2297 | 3822 | 5158 | 6540 |
| Y | 496 | 4562 | 6912 | 9543 | 13353 |
| Z | 578 | 1817 | 2745 | 11575 | 14830 |
Based on this information, which of the following statements is false?
Source: 2023 SJChO P1 Q38
The first eight ionisation energies of an element Q in kJ mol−1 are 966, 1950, 2730, 4850, 6020, 12 300, 15 400 and 18 900. Which of the following statements about element Q is correct?
Source: 2021 SAJC J2 Prelim P1 Q2
Which statement best explains why the second ionisation energy of sodium is higher than that of magnesium?
2018 RVHS J1 Common Test P1 Q4
Rubidium and bromine form ions that are isoelectronic. Which statements are correct?
1 The ionic radius of rubidium is smaller than its atomic radius.
2 The ionic radius of bromine is larger than its atomic radius.
3 The ionic radius of bromine is smaller than that of rubidium.
2022 NJC J2 Prelim P1 Q6
Which statement about the Period 3 elements and their oxides is false?
2020 SAJC J2 Prelim P1 Q14
P, Q, R and S are elements in Period 3.
The oxide of P dissolves in water to give a solution with pH less than 7.
The oxide of Q has a giant covalent structure.
Element R is a metal which floats on water.
Element S is used to fill light bulbs.
Which arranges the four elements in order of increasing proton number?
2024 Woodlands O Prelim P1 Q23
What is the order of the pH of the solutions formed when these oxides are added to water?
| lowest pH | highest pH | |||
|---|---|---|---|---|
| A | SO3 | SiO2 | MgO | Na2O |
| B | Na2O | MgO | SiO2 | SO3 |
| C | MgO | SiO2 | SO3 | Na2O |
| D | SO3 | Na2O | MgO | SiO2 |
2019 HCI J2 Prelim P1 Q27
Which statement does not describe the chemical properties of Period 3 compounds?
2019 NJC J2 Prelim P1 Q15
The oxides of four Period 3 elements W, X, Y and Z behave as follows.
The oxide of W is insoluble in water and in dilute HCl, but dissolves in concentrated NaOH.
The oxide of X is insoluble in water but dissolves in both dilute HCl and dilute NaOH.
The oxide of Y dissolves in dilute NaOH at room temperature.
The oxide of Z dissolves in water to form a solution of pH 13.
What is the order of increasing atomic number?
2019 NYJC J2 MYE P1-P3 Q16
X, Y and Z are in Period 3. The oxide of X gives a solution of pH less than 7. The oxide of Y reacts with both strong acids and strong alkalis. The oxide of Z gives a strongly alkaline solution. What is the order of increasing atomic radius?
2019 SAJC J2 Prelim P1 Q19
Four elements with atomic numbers 11 to 17 have these properties.
The chloride of E dissolves in water and turns moist blue litmus red.
The oxide of F is amphoteric.
G has the lowest electronegativity of the four.
H has the smallest atomic radius.
What is the order of increasing atomic number?
2019 CJC J2 Prelim P1 Q14
Element X is in Period 3. Three of these statements about X or its compounds are correct and one does not fit. Which statement does not fit?
2021 CJC J2 Prelim P1 Q9
Element G is one of the first five elements in Period 3. Three of these statements about G or its compounds are correct and one is false. Which statement does not fit?
2021 TMJC J2 Prelim P1 Q6
Element Z is in Period 3. Its oxide has a giant molecular structure and its chloride is a simple molecule. Which statements are correct?
1 Element Z is a solid at room temperature.
2 The oxide of Z reacts with water to give an acidic solution.
3 Z forms two chlorides with different oxidation states.
2021 YIJC J2 Prelim P1 Q29
Element Y in Period 3 is a metalloid and semiconductor, and its chloride reacts with water to form an acidic solution. Element X has an atomic number one less than Y. What is a property of the oxide of X?
2023 HCI J2 Prelim P1 Q27
M, N and O are in the same period. The oxide of M reacts with water to form a solution of pH less than 7. The oxide of N reacts with water to form a solution that turns damp red litmus blue. The oxide of O dissolves in both hydrochloric acid and aqueous sodium hydroxide. What is the order of increasing proton number?
2024 BBSS O Prelim P1 Q20
Which statement is not true of the trends of the Group 2 elements and their compounds?
2018 NYJC J2 MYE P1-P3 Q17
Which property generally increases down Group 2?
2021 CJC J2 Prelim P1 Q10
The Group 2 metals have higher melting points than the Group 1 metals. Which factors could contribute?
1 There are smaller distances between atoms in the metallic lattices of the Group 2 metals.
2 Two valence electrons from each Group 2 atom are available for bonding in the lattice.
3 The Group 2 metals have the higher first ionisation energy.
2023 ACJC J2 Prelim P1 Q4
Which statement about the Group 17 elements and their compounds is incorrect?
2022 TJC J2 Prelim P1 Q9
X is a Group 1 metal more reactive than sodium. Y and Z are Group 17 elements. X reacts with Y to form a salt. A solution of this salt reacts with Z to form a different salt. What are X, Y and Z?
| X | Y | Z | |
|---|---|---|---|
| A | K | Cl2 | I2 |
| B | Li | Cl2 | Br2 |
| C | Li | Br2 | Cl2 |
| D | K | I2 | Cl2 |
2024 Greendale O Prelim P1 Q23
Metals Q, R, S and T form cations Q2+, R2+, S+ and T2+. Solid Q placed in a solution of T2+ becomes coated with T. Solid Q does not react with a solution of R2+. Only the carbonate of S does not decompose on heating. T reacts with hydrochloric acid to give hydrogen. What is the order of decreasing reactivity?
2024 Zhonghua O Prelim P1 Q28
The table shows three metals and how each is extracted.
| metal | method of extraction |
|---|---|
| P | reduction of the ore by carbon |
| Q | electrolysis |
| R | mined from the ground as the metal |
Which statement is true?
2024 QTSS O Prelim P1 Q25
A warship had its hull plated with copper. After two years at sea, the iron parts in contact with the copper plates were more corroded than normal. What is the best explanation?
2024 VS O Prelim P1 Q29
