Hợp chất X có công thức phân tử dạng AB₂ có A = 50% (Về khối lượng) và tổng số proton là 32. Nguyên tử A và B đều có số p bằng số n. Số oxi hóa của A trong X là 

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  sentence                pointing                 verbal                 attract

• Choose a word that has different stress pattern:

  problem                minute                  suppose                   dinner

• Choose one sentence that has the closest meaning to the root one:

  “How beautiful is the dress you have just bought!” Peter said to Mary.
  
  

• Choose one sentence that has the closest meaning to the root one:

  She raised her hand high so that she could attract her teacher’s attention.
  
  

• Choose one sentence that has the closest meaning to the root one:

  “Hello, Mary!” Peter said.
  
  

• Choose one sentence that has the closest meaning to the root one:

  Julie and Anne had not met each other before the party.
  
  

• Choose one sentence that has the closest meaning to the root one:

  “Why don’t you ask the teacher for help?” Peter asked me.
  
  

• Choose a word that has different stress pattern:

  noisy            party                 social               polite

• Choose a word that has different stress pattern:

  restaurant                    assistance                  usually                compliment

• Choose a word that has different stress pattern:

  impolite                exciting                attention             attracting