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The Periodic Table
Quick questions on The Periodic Table and periods: N(A)-Level Chemistry
7short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is order of the table?Show answer
The elements are arranged in order of increasing proton number, starting at hydrogen. Each element has one more proton, and one more electron, than the one before. This steady increase creates a repeating pattern of properties, which is why the table is laid out in rows and columns.
What are groups?Show answer
A group is a vertical column in the table, numbered I to VIII (or 0). Elements in the same group have the same number of electrons in their outer shell, which is why they have similar chemical properties:
What are periods?Show answer
A period is a horizontal row in the table. Going across a period, each element gains one more electron in the same outer shell. The period number equals the number of occupied shells. So an element in Period 3 has three shells holding electrons.
What is reading position from electron arrangement?Show answer
You can find an element's place from its electron arrangement:
What is q1?Show answer
State the group and period of an element with the electron arrangement . [2 marks]
What is q2?Show answer
Explain why all the elements in Group VII have similar chemical properties. [2 marks]
What is q3?Show answer
State the principle on which the order of the Periodic Table is based. [1 mark]
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