Astatine is an element in Group VII of the Periodic Table. Astatine is $$$1 \ldots$$$. reactive than iodine. The melting point of astatine is 2 than the melting point of iodine. Astatine is 3 in colour than bromine. Which words complete gaps 1,2 and 3 ?

Chemistry

IGCSE&ALevel

CAIE

Exam No：0620_w17_qp_11 Year：2017 Question No：22

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

8.3.1.1. 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