Which of the following statements about isotopes is true? A) Isotopes of the sam

Question

Which of the following statements about isotopes is true? A) Isotopes of the same element differ only in the number of electrons they contain. B) An isotope of an atom with a larger number of neutrons is larger than an isotope of the same atom that contains fewer neutrons. C) Isotopes of the same element have the same mass. D) Isotopes of the same element don't usually have the same properties. E) Some elements have 3 or more naturally occurring isotopes. Determine the number of protons, neutrons and electrons in the following.^25_12X A) P^+ = 12 n degree = 25e^- = 12. B) P^+ = 12 n degree = 12e^- = 13 C) P^+ = 12 n degree = 13e^- = 12 D) P^+ = 25 n degree = 12e^- = 13 E) P^+ = 12 n degree = 13e^- = 25 What species is represented by the following information? P^+ = 47 n degree = 62 e^- = 46 A) Ag^+ B) Nd C) Pd D) Ag E) Pd^+ Calculate the atomic mass of element "X" if it has 2 naturally occurring isotopes with the following masses and natural abundances. X-45 44.8776 amu 32.88% X-47 46.9443 amu 67.12% A) 46.26 amu. B) 45.91 amu C) 46.34 amu D) 46.84 amu E) 44.99 amu Calculate the mass (in kg) of 4.87 times 10^25 atoms of Zn (molar mass of Zn = 65.38 g/mole) A) 5.290 kg B) 1.89 kg C) 8.09 kg D) 1.24 kg E) 1.09 kg How many Zn atoms are contained in 922 g of Zn? A) 5.90 times 10^25 Zn atoms B) 7.09 times 10^21 Zn atoms C) 8.49 times 10^24 Zn atoms D) 4.27 times 10^22 Zn atoms E) 4.18 times 10^24 Zn atoms Calculate the energy of the violet light emitted by a hydrogen atom with a wavelength of 410.1 nm. A 4.85 times 10^-19 B) 2.06 times 10^-19 J C) 1.23 times 10^-19 J D) 8.13 times 10^-19 J E) 5.27 times 10^-19 J Which of the following occur as the energy of a photon increases? A) The frequency decreases. B) The speed increases. C) The wavelength increases D) The wave gets shorter. E) None of the above occur as the energy of photon increases. How many orbitals are contained in the third principal level (n = 3) of a given atom? A) 9 B) 3 C) 18 D)7

Explanation / Answer

1. The answer is B

Isotopes are atoms with the same number of protons but that have a different number of neutrons. Hence, the number of proton and electron do not differ in isotope. Also, the do not have same mass. Further they have similar chemical property and an element can also have two isotopes. Hence, A, C, D and E are ruled out and the correct answer is C.

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