Atomic Structure Review

Emma is reading a science textbook and comes across the abbreviation 'amu'. What does amu stand for?

Henry is studying different samples of oxygen in his science class. He learns that some oxygen atoms have different masses, but they all have the same atomic number. Which of the following statements about these oxygen atoms is NOT true?

Samuel is looking at the atomic masses on the periodic table and notices that most of them have decimals. The reason for this is because

Charlotte is working in a chemistry lab and needs to determine how many electrons are in the ion $$Al^{3+}$$ for her experiment. How many electrons does this ion have?

Grace is studying different types of hydrogen atoms in her chemistry class. She comes across the isotope $$^{1}H$$ . How many neutrons does this isotope have?

Zoe is studying ions in her chemistry class. She comes across the ion $$S^{2-}$$ and wants to know how many protons it contains. Can you help her?

Liam is studying isotopes in his chemistry class. He comes across the isotope $$^{26}\mathrm{Al}$$ . How many protons does this isotope have?

Oliver is studying ions in his chemistry class. He observes a $$Na^{+1}$$ ion and notes that it has more ______ than ________.

Rohan is studying ions in his chemistry class. He learns that an $$O^{2-}$$ ion has more ______ than ________.

Charlotte is working in a laboratory and is analyzing a sample containing the isotope $$^{63}\mathrm{Ni}$$ . She needs to determine how many neutrons are present in this isotope. How many neutrons does $$^{63}\mathrm{Ni}$$ have?