The atomic symbols of the first twenty elements in the Periodic Table are shown in Figure 3.
Figure 3
☐ | A | metal | |
☐ | B | halogen | |
☐ | C | compound | |
☐ | 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 / °C | boiling point / °C |
fluorine | –220 | –188 |
chlorine | –101 | –35 |
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 = .............................................................. °C
Chlorine reacts with potassium iodide to form iodine and potassium chloride.
Complete the word equation for the reaction between bromine and potassium astatide.
bromine + potassium astatide → +
Hydrogen reacts with chlorine to form hydrogen chloride.
The symbol – 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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