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Chemistry, 20.09.2020 05:01 orlando19882000

12. Which of the following species has the least mass?
A. Electron C. Hydrogen ion
B. Helium atom D. Neutron
13. The mass number of an element whose
atom contains 13 electrons, 13 protons and
14 neutrons is
A. 13 B. 26 C. 27 D. 40
14. Which of the following elements exhibits
variable oxidation states and forms

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12. Which of the following species has the least mass?
A. Electron C. Hydrogen ion
B. Hel...

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