The atomic symbols of the first twenty elements in the Periodic Table are shown in Figure 3.
Figure 3
Ā | ā | A | metal |
Ā | ā | B | halogen |
Ā | ā | C | compound |
Ā | ā | D | gas at room temperature |
(1)
(1)
Figure 4 shows information about some of the elements in Group 7 of the Periodic Table.
element | melting point / Ā°C | boiling point / Ā°C |
fluorine | ā220 | ā188 |
chlorine | ā101 | ā35 |
bromine | 7 | 59 |
iodine | 114 | 184 |
Figure 4
Astatine is below iodine in Group 7 of the periodic table.
Estimate the boiling point of astatine.
boiling point of astatine = .............................................................. Ā°C
Chlorine reacts with potassium iodide to form iodine and potassium chloride.
Complete the word equation for the reaction between bromine and potassium astatide.
Ā Ā Ā bromine + potassium astatide āĀ Ā Ā Ā Ā Ā Ā +
Hydrogen reacts with chlorine to form hydrogen chloride.
The symbol ā is used to show a covalent bond.
The electronic configuration of hydrogen is 1.
The electronic configuration of chlorine is 2.8.7.
Draw the dot-and-cross diagram for the molecule of hydrogen chloride.
Show outer electrons only.
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