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Question 24
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Table 1: First ionisation energies of selected Period 4 elements
Symbol
Atomic number
First ionisation energy in
kJ mol−1\text{kJ}\ \text{mol}^{-1}
kJ
mol
−
1
K
19
419
Ca
20
590
Ga
31
579
Ge
32
762
As
33
947
Se
34
941
Br
35
1140
Using your Periodic Table, give the relative atomic mass of selenium.
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The periodic table Questions
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