1 81 Consider the isotope bromine 81 35Br Select the combination which lists the correct atomic number number of neutrons and mass number respectively A B C D E 2 35 46 81 35 81 46 81 46 35 46 81 35 35 81 116 Silicon is used widely in the modern electronics industry It has three naturally occurring isotopes 28Si 29Si and 30Si The abundance of 28Si is 92 23 Calculate the percent abundance of 29Si and 30Si in this order if the average atomic mass of silicon is 28 0855amu The mass of each isotope is given below Isotope 28 29 30 A B C D E Si Si Si Isotopic Mass amu 27 9769 28 9765 29 9738 2 85 and 4 92 5 10 and 2 67 4 22 and 3 55 4 66 and 3 11 3 48 and 4 29 100 92 23 7 77 0 9223 27 9769 x 28 9765 0 777 x 29 9738 28 0855amu 25 8030 28 9765x 2 3290 29 9738x 28 0855amu 0 9973x 0 0465 x 0 0465 0 0466 x 100 4 66 29 Si 0 9973 30 Si 7 77 4 66 3 11 1 3 Which of these elements is chemically similar to potassium A B C D E 4 How many atoms are in 0 534 mol of nickel Ni A B C D E 5 9 94 x 102 1 05 x 1022 8 41 x 10 2 1 01 x 101 1 19 x 101 moles moles moles moles moles 17 4 g Pb x 1 mol Pb 8 41 x 10 2 moles Pb 207 g Pb What is the frequency of light having a wavelength of 360nm A B C D E 7 6 13 x 1024 atoms 0 534 mol Ni x 6 022 x 1023 Ni atoms 3 22 x 1023atoms 5 48 x 1025 atoms 1 mol Ni 22 4 34 x 10 atoms 3 22 x 1023 atoms 2 98 x 1021 atoms How many moles are present in 17 4 grams of lead Pb A B C D E 6 calcium arsenic phosphorus cerium sodium 8 3 x 1014 s 1 6 2 x 10 6 s 1 5 3 x 105 s 1 3 1 x 102 s 1 2 1 x 10 15 s 1 3 00 x 1017 nm s 8 3 x 1014 s 1 360 nm Select the arrangement of electromagnetic radiation which starts with the lowest energy and increases to greatest energy A B C D E radio infrared ultraviolet gamma rays visible ultraviolet infrared gamma rays gamma rays infrared radio ultraviolet gamma rays visible infrared radio infrared ultraviolet radio gamma rays 2 8 What is the wavelength of radiation that has a frequency of 6 91 x 1014s 1 A B C D E 9 3 00 x 1017 nm s 6 91 x 1014s 1 4 34 x 102 nm 1 50 x 10 7 nm hc 6 63 x 10 34 J s 3 00 x 1017nm s 2 1 50 x 10 nm E 1 32 x 10 18 J 1 99 x 1015 nm 1 99 x 1024 nm 1 50 x 102 nm none of these choices is correct What is the energy in joules of a mole photons whose wavelength if is 850 nm A B C D E 11 nm nm nm nm nm If the energy of a photon is 1 32 x 10 18 J what is its wavelength in nm A B C D E 10 2 45 x 10 15 4 34 x 102 5 30 x 106 7 07 x 1033 8 34 x 10 7 2 56 x 104 1 71 x 105 2 34 x 10 19 2 12 x 1042 1 41 x 105 J E hc 6 63 x 10 34 J s 3 00 x 1017nm s x 6 022 x 1023 J 850 nm J J E 1 41 x 105 J J Calculate the wavelength in nm of light emitted by a hydrogen atom when its electron transitions from n 5 to the n 2 principal energy level A B C D E 4 45 x 10 20 nm E 2 18 x 10 18J 6 2 16 x 10 nm 9 18 x 10 20 nm 4 34 x 102 nm 1 38 x 1014 nm 1 1 2 2 2 5 4 58 x 10 19 J hc 6 63 x 10 34 J s 3 00 x 1017nm s E 4 58 x 10 19 J 4 34 x 102 nm 3 12 Which of the following is a correct set of quantum numbers for an electron in a 5f orbital A B C D E 13 m m m m m 1 3 0 1 3 n m ms 3 3 4 4 2 2 3 2 3 2 3 1 3 0 2 1 2 1 2 1 2 1 2 1 2 What is the maximum number of electrons that can have the following quantum numbers n 3 ms A B C D E 15 3 2 3 2 1 Which of the following set of quantum numbers is possible A B C D E 14 n 5 n 5 n 4 n 4 n 5 5 electrons 9 electrons 12 electrons 18 electrons 36 electrons n 3 0 1 2 Because the spin of the electron was specified as only one electron will occupy an orbital Which of the following is the correct ground state electron configuration for silver Ag A B C D E Kr 5s24d9 Ar 4s23d9 Kr 5s14d10 Kr 5s24d105p4 Kr 5s15p10 4 16 17 How many of the following elements have three unpaired electrons Ca Cr A B C D E 1 2 3 4 5 Se Sb I V a halogen a transition metal a nonmetal a noble gas an alkaline earth metal 2 3 4 14 36 Tin is in group 4A therefore has four valence electrons Which of the following atoms has the largest radius A B C D E 20 Nb How many valence electrons does a tin Sn atom have A B C D E 19 O An element with the electron configuration Kr 5s24d7 is A B C D E 18 P B Ga Br Al Cl The element that is farthest to the left in a period and is lowest with a group Which of these elements has the smallest first ionization energy A B C D E Cl Na Be K Ar The element that gives away electron s easily that is one that would acquire a noble gas core after the loss of of one electron It there are two of these elements then the one that is larger will have the lower first ionization energy 5 21 Which of the following atoms would accept an electron most readily A B C D E 22 Two ions that have the same electron configuration Cl and Ca2 both have the Ar core therefore are isoelectronic Ar 3d5 Ar 4s13d5 Ar 4s23d4 Ar 3d6 Ar 4s23d9 The electron configuration …