Nguyên tố X có 2 phân lớp cuối cùng là 3d¹⁰4s¹. X thuộc chu kì và nhóm nào sau đây ?

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the word that has the underlined part pronounced differently from the rest: 

  clap                catch                  waving                 handle

• Choose the word that has the underlined part pronounced differently from the rest: 

  maximum                  jump                     summarize                     abrupt

• Choose the word that has the underlined part pronounced differently from the rest: 

  kidding                    signal                whistle                  slight

• Choose the word that has the underlined part pronounced differently from the rest: 

  cue                     cite                   course                      cable

• Choose the word that has the underlined part pronounced differently from the rest: 

  reason                     realize                  lead                 speak

• Choose a word that has different stress pattern:

  attract                 suppose                    install                   happen

• Choose a word that has different stress pattern:

  airport                   schoolyard                   approach                    social

• Choose a word that has different stress pattern:

  towards                verbal                   waiter                   passport

• Choose a word that has different stress pattern:

  valuable               astonishment                    machinery                 formality

• Choose a word that has different stress pattern:

  addition                 discipline                 misbehave                   interpret