How many protons, electrons, and electrons are in the ion 129Te2-?
回答 (1)
2017-09-20 1:56 pm
Refer to the Periodic Table. The atomic number of Te = 52
Hence, Number of protons in a Te atom = Number of electrons in a Te atom = 52
The mass number of ¹²⁹Te = 129
This means that the total number of protons and neutrons in a Te atom = 129
Hence, the number of neutrons in a Te atom = 129 - 52 = 77
A ¹²⁹Te atom gains 2 electrons to form a ¹²⁹Te²⁻ ion, and the number of protons and that of neutrons are unchanged.
Hence,
Number of protons in a ¹²⁹Te²⁻ ion = 52
Number of electrons in a ¹²⁹Te²⁻ ion = 52 + 2 = 54
Number of neutrons in a ¹²⁹Te²⁻ ion = 77
Hence, Number of protons in a Te atom = Number of electrons in a Te atom = 52
The mass number of ¹²⁹Te = 129
This means that the total number of protons and neutrons in a Te atom = 129
Hence, the number of neutrons in a Te atom = 129 - 52 = 77
A ¹²⁹Te atom gains 2 electrons to form a ¹²⁹Te²⁻ ion, and the number of protons and that of neutrons are unchanged.
Hence,
Number of protons in a ¹²⁹Te²⁻ ion = 52
Number of electrons in a ¹²⁹Te²⁻ ion = 52 + 2 = 54
Number of neutrons in a ¹²⁹Te²⁻ ion = 77
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