The block of the periodic table to which an element belongs is decided by
Correct answer: C. the subshell that receives the last electron added
- A. the number of shells it has
- B. its atomic mass
- C. the subshell that receives the last electron added
- D. whether it is a metal or a non metal
Explanation
Elements are assigned to the s, p, d or f block according to the subshell into which the differentiating electron enters, so groups I and II form the s block and groups III to VIII the p block. This classification explains why elements in the same block share broad chemical behaviour. Period number, by contrast, is given by the number of the outermost shell.
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About Blocks of the Periodic Table
Electron configurations divide elements into s, p, d and f blocks according to the subshell receiving the last electron. Work includes the positions, valence-shell configurations and general properties of s-block and p-block elements, along with periodic trends in atomic size, ionisation energy, electron affinity and electronegativity.
Practise s-Block and p-Block Elements
1,359 free s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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