With regard to the species^16 O^2-, ^19 F and^20 Ne, which of the following stat
ID: 528267 • Letter: W
Question
With regard to the species^16 O^2-, ^19 F and^20 Ne, which of the following statements is correct? A) All three species contain 10 electrons. B) The sum of the neutrons in all three species is 27. C) The sum of the protons in all three species is 28. D) Both^19 F and^20 Ne contain 20 neutrons. E) none of the above What is the formula of the compound formed between strontium ions and nitrogen ions? A) SrN B) SrN_3 C) Sr_2 N_2 D) Sr_2 N_3 E) SrN_2 Which of the following occur as the energy of photon increases? A) the frequency decreases. B) the speed increases. C) the wavelength increases. D) the wavelength decreases. E) None of the above occur as the energy of a photon increases. Which of the following compounds would you expect to be a molecular compound? A) Na_2 O B) BaO C) Cs_2 S D) CO_2 E) CaF_2 Choose the statement below that is TRUE. A) A weak acid solution consists of mostly nonionized acid molecules. B) The term "strong electrolyte" means that the substance is extremely reactive. C) A strong acid solution consists of only partially ionized acid molecule. D) The term "weak electrolyte" means that the substance is inert. E) A molecular compound that does not ionize in solution is a strong electrolyte.Explanation / Answer
AZX A =Mass number =Number of protons + Number of neutrons , Z = Atomic number = Number of protons
Number of protons is equal to number of electrons in neutral atom
168O2- A = 16 , Z =8 , Number of neutrons =8
Number of electrons = 8 + 2 (Since -2 charge is present) =10
199F- A = 19 , Z =9 , Number of neutrons =10
Number of electrons = 9 + 1 (Since -1 charge is present) =10
2010Ne A =20 , Z =10 ,Number of neutrons =10
Number of electrons =10
Since all the species contains 10 electrons so option (A) is correct
Sum of neutrons in all species = 8 + 10 + 10 =28
Since the sum of number of neutrons in all three species is 28 , so option (B) is incorrect.
Sum of protons in all three species = 8 + 9 +10 =27
Since the sum of number of protons in all three species is 27 so option (C) is incorrect.
Number of neutrons in 19F- and 20Ne is 10 respectively , so option (D) is incorrect.
Only correct option is (A).
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