Chemistry
Study the information given in the table below and answer the questions that follow. (Note- the letters do not represent the actual symbols of the elements)
| Element | Electronic configuration | Ionisation energy kjmol-1 |
|---|---|---|
| X | 2,2 | 900 |
| Y | 2,8,2 | 738 |
| Z | 2,8,8,2 | 590 |
(a) Explain why element X has highest ionisation energy.
(b) To which period does Z belong?
(c) Draw the electron dot structure of the compound formed between Z and oxygen.
Periodic Table
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Answer
(a) Element X has the highest ionisation energy because it has the smallest atomic size, fewer electron shells, and its valence electrons experience a stronger attraction to the nucleus.
(b) Z has the configuration of 2,8,8,2, electrons occupying K,L,M and N shells. Hence, Z belongs to Period 4.
(c) The electron dot structure of the compound formed between Z and oxygen is shown below:
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