Xác định nguyên tử R biết cation R⁺ có cấu hình electron phân lớp ngoài cùng là 2p⁶. 

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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 others

  Choose the word that has the underlined part pronounced differently from others: nation, patent, inspiration, patient.

• Choose the word that has the underlined part pronounced differently from others: attacks, repeats, lives, coughs

• Choose the word whose stress pattern is different from that of the other three

  Choose the word whose stress pattern is different from that of the other three: opponent, attendance, adventure, penalty.

• Choose the word whose stress pattern is different from that of the other three: signal, person, instance, attract.

• Choose the best option A, B, C or D to complete the sentence

  I took off the shoes before entering the room ______

• Mike: “I took a picture of you just now.” – Robert: “Really? I ______ with attention.”

• Failure to win the championship will ______ in the dismissal of the coach.

• He only had time to ______ into the report. He couldn’t read it thoroughly.

• ____ from school for three weeks, so he is trying his best to catch up with the other students.

• _____ the whole, Japanese cars are very reliable and breakdowns are rare.