The elements in Group VII of the Periodic Table are known as the halogens. Halogens can form halide ions. Name a halide compound which can be used to detect the presence of water. ..........................................................................................................................................

Chemistry

IGCSE&ALevel

CAIE

Exam No：0620_m24_qp_42 Year：2024 Question No：2(e)

Answer:

8.1.1. Describe the Periodic Table as an arrangement of elements in periods and groups and in order of increasing proton number / atomic number

8.1.2. Describe the change from metallic to non-metallic character across a period

8.1.3. Describe the relationship between group number and the charge of the ions formed from elements in that group

8.1.4. Explain similarities in the chemical properties of elements in the same group of the Periodic Table in terms of their electronic configuration

8.1.5. Explain how the position of an element in the Periodic Table can be used to predict its properties

8.1.6. Identify trends in groups, given information about the elements

8.2.1.1. decreasing melting point

8.2.1.2. increasing density

8.2.1.3. increasing reactivity

8.2.2. Predict the properties of other elements in Group I, given information about the elements

8.3.1.1. increasing density

8.3.1.2. decreasing reactivity

8.3.2.1. chlorine, a pale yellow-green gas

8.3.2.2. bromine, a red-brown liquid

8.3.2.3. iodine, a grey-black solid

8.3.3. Describe and explain the displacement reactions of halogens with other halide ions

8.3.4. Predict the properties of other elements in Group VII, given information about the elements

8.4.1.1. have high densities

8.4.1.2. have high melting points

8.4.1.3. form coloured compounds

8.4.1.4. often act as catalysts as elements and in compounds

8.4.2. Describe transition elements as having ions with variable oxidation numbers, including iron(II) and iron(III)

8.5.1. Describe the Group VIII noble gases as unreactive, monatomic gases and explain this in terms of electronic configuration