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Protons and Isotopes Quick Check Answers
1. Which statement describes the number of protons in each atom of an element?
Answer: *The number of protons is given by the atomic number, which increases by one moving from left to right across each row of the periodic table.*
2. An element has an atomic number of 16. An ion of this element has a 2– charge. How was the ion formed?
Answer: *A neutral atom gained 2 electrons. *
3. Rubidium has an atomic number of 37 and a mass number of 85. How many protons, neutrons, and electrons does an ion of rubidium with a 1+ charge have?
Answer: *37 protons, 48 neutrons, and 36 electrons*
4. There are three stable forms of neon: neon-20, neon-21, and neon-22. Which statement is true?
Answer: *Their atomic masses differ. *
5. Beryllium has an atomic number of 4. How many neutrons does the isotope beryllium-9 have?
Answer: *5*
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