Which particle has more protons than electrons AND more protons than neutrons? Help?
1) D3O+
2)H3O+
3)NH2-
4)OD-
(D=2/1 H )
Answer is 2) but i dont know why though.
回答 (2)
Each D atom has 1 proton, 1 neutron and 1 electron.
Each O atom has 8 protons, 8 neutrons and 8 electrons.
Each H atom has 1 proton, no (0) neutron and 1 electron.
Each N atom has 7 protons, 7 neutrons and 7 electrons.
When an ion carrying a positive charge is formed, 1 electron has been lost.
When an ion carrying a negative charge is formed, 1 electron has been gained.
(1) In D₃O⁺ :
Number of protons = 1×3 + 8 = 11
Number of electrons = 1×3 + 8 - 1 = 10
Number of neutrons = 1×3 + 8 = 11
(Number of protons > Number of electrons) and (Number of protons = Number of neutrons)
(2) In H₃O⁺ :
Number of protons = 1×3 + 8 = 11
Number of electrons = 1×3 + 8 - 1 = 10
Number of neutrons = 0×3 + 8 = 8
(Number of protons > Number of electrons) and (Number of protons > Number of neutrons)
(3) In NH₂⁻ :
Number of protons = 7 + 1×2 = 9
Number of electrons = 7 + 1×2 + 1 = 10
Number of neutrons = 7 + 0×2 = 7
(Number of protons < Number of electrons) and (Number of protons > Number of neutrons)
(4) In OD⁻ :
Number of protons = 8 + 1 = 9
Number of electrons = 8 + 1 + 1 = 10
Number of neutrons = 8 + 1 = 9
(Number of protons < Number of electrons) and (Number of protons = Number of neutrons)
...... The answer is : (2) H₃O⁺
D₃O⁺ has more protons than electrons (because it's positively charged), but deuterium and oxygen have equal numbers of protons and neutrons.
H₃O⁺ has more protons than electrons (because it's positively charged). But because ordinary hydrogen has no neutrons, this particle has more protons than neutrons.
NH₂⁻ has more electrons than protons (because it's negatively charged).
OD⁻ has more electrons than protons (because it's negatively charged).
收錄日期: 2021-04-18 14:57:32
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