The Periodic Table: Classification of Elements (HL IB Chemistry)

An element is found in Group I of the Periodic Table, below lithium and sodium. From this information it is likely that the element is a metal with 

A student opens a freezer in their lab to remove a test tube containing an oxide of a Period 3 element. The oxide is a solid and forms a solution with a low pH when dissolved in water. 

Identify the element.

The x-axis of the graph below is the atomic number of the elements in Period 3.

Which variable could represent the y-axis?

The first ionisation energies and reactions with water for sodium and caesium are compared below.

Which set of statements, comparing sodium and caesium, are correct?

An element Z has the same oxidation state as a common iron ion but the Z ion has the same number of electrons as Ne . An oxide of element Z reacts with a strong acid to produce a chloride salt but does not dissolve in water.

What is the correct identity of element Z?

X, Y and Z represent different halogens. The table shows the results of nine experiments in which aqueous solutions of X₂, Y₂ and Z₂ were separately added to separate aqueous solutions containing X^-, Y^- and Z^- ions.

What is the correct order to show the decreasing strength of the ions X^-, Y^- and Z^-  as reducing agents?

A dark red/brown solution is formed when a halide salt containing the halide ion Y^- reacts with aqueous chlorine. This solution then forms a violet solution when shaken with a cyclohexane solution.

What is halogen, Y?

A student reacts the most basic period 3 oxide with the strongest acid formed from a period 3 element.

Identify the correct equation for this reaction

Which of the following is the most stable common oxidation state of manganese?

Which metal sulfate solution is coloured?

Which complex has the greatest d orbital splitting?

The species Cl^-, K⁺ and Ar are isoelectronic. This means that they have the same number of electrons. 

In which order do their radii decrease?

The atomic radius of the elements decreases across period 3. Which of the following statements explain(s) this phenomenon? 

The first ionisation energy of beryllium is higher than the first ionisation energy of boron. 

Which statement explains why?

The electronic configurations of four different atoms are shown. 

Which atom has the highest first ionisation energy?

Sir Humphrey Davy discovered the elements magnesium, boron, sodium and calcium. 

Which of the elements Sir Davy discovered has the third lowest first ionisation energy in its Period and the third smallest atomic radius in its Group?

Which of the following pairs does the second element have a higher 1st ionisation energy than the first element?

Shown on the graph are the relative values of the first ionisation energies of four elements that have consecutive atomic numbers. One of the elements reacts with hydrogen to form a covalent compound with formula HX. 

Which element could be X?

Element J has a lower first ionisation energy and higher melting point than the element preceding it in the periodic table. 

Its ion is isoelectronic with argon. 

What is the identity of element J?

Which statement about electron affinity and electronegativity is correct?

The Period 4 elements gallium (Ga), germanium (Ge), arsenic (As) and selenium (Se) are the elements directly below aluminium, silicon, phosphorus and sulfur in the Periodic Table.

The properties of each Period 4 element resemble those of the Period 3 element directly above it.

Which period 4 elements form oxides that dissolve in water to give an acidic solution?

Non-metallic elements in the p block can have the following two properties:

• property 1: atoms with no paired electrons in 3p
• property 2: have an oxide that can form a strong acid in water

Which properties do phosphorus and sulfur have? 

Which graph correctly illustrates a trend found in the halogen group?

Which of the following statements is true as you move down Group I?

Which statement is not correct?

When a student dissolved the oxides of calcium and tellurium in water, the resulting solutions were tested with litmus paper. It would be seen that:

Which of the following statements about strontium oxide and lithium oxide are true?

1. Strontium oxide has pH > 7
2. Lithium oxide is basic
3. A solution containing both oxides would turn universal indicator red 

Which statements are correct?

1. Fluorine will react with potassium chloride solution to produce chlorine.
2. Iodine will react with sodium chloride solution to produce chlorine.
3. Bromine will react with lithium iodide solution to produce iodine.

Which is a characteristic property of sodium oxide?

Electron configurations for atoms of different elements are shown below. 

Which electron configuration represents the element with the largest first ionisation energy?

Which graph correctly shows the relative melting points of period 3 elements plotted against their relative electronegativities?

For the following pairs, which has the greatest difference in size?

Elements X and Y are Period 3 elements that react together to form compound Z. Element X has the second smallest atomic radius in Period 3. Apart from argon, there is only one element in Period 3 which has a lower melting point than element Y.

Which compound could be Z?

Which of these elements would form the largest ion with a noble gas electron configuration?

The order of the elements in the periodic table is

Which complex is likely to be colourless?

Part of the spectrochemical series is shown. 

I⁻< Cl ⁻ < H₂O < NH₃ 

Which statement can be correctly deduced from the series?