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Questions and Answers
Which of these observations contributed to Dalton’s model of the atom?
Which of these observations contributed to Dalton’s model of the atom?
- Most of the elements exist as solid materials under normal conditions on Earth.
- Several different elements can have very similar chemical properties. (correct)
- A pair of elements can form several compounds that are composed of different ratios of the elements.
- Compounds made up of two elements can have properties that are very different from either element.
What is the average atomic mass of strontium?
What is the average atomic mass of strontium?
- 87.7 amu
- 86.3 amu
- 86.5 amu (correct)
- 87.2 amu
Based on their locations on the periodic table, which statement about sodium and potassium is true?
Based on their locations on the periodic table, which statement about sodium and potassium is true?
- Sodium has a larger ionic radius than potassium. (correct)
- Sodium is less electronegative than potassium.
- Sodium has fewer orbital shells than potassium.
- Sodium has lower ionization energy than potassium.
The atomic number of aluminum is 13. What is the correct designation of the electron configuration of aluminum?
The atomic number of aluminum is 13. What is the correct designation of the electron configuration of aluminum?
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What is the electron configuration of this atom?
What is the electron configuration of this atom?
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