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sweet [91]
3 years ago
7

Which two metalloids have the same number of electrons shells as iodine? A. boron and silicon B. antimony and tellurium C. germa

nium and arsenic D. astatine and boron
Chemistry
2 answers:
shepuryov [24]3 years ago
5 0
B.) ANTIMONY & TELLURIUM
maxonik [38]3 years ago
5 0

Answer is: B. antimony and tellurium.

1) Iodine (I) is an element with atomic number 53 (53 protons and 53 electrons), it is in group 17 (halogen element) and period 5 (principal quantum number n = 5, which means it has 5 electrons shell) of Periodic table.

Electron configuration of iodine atom: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁵.

2) Tellurium (Te) is an element with atomic number 52 (52 protons and 52 electrons), it is in group 16 (chalcogens) and period 5 (principal quantum number n = 5, which means it has 5 electrons shell) of Periodic table.

Electron configuration of tellurium atom: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁴.

3) Antimony (Sb) is an element with atomic number 51 (51 protons and 51 electrons), it is in group 15 (pnictogens) and period 5 (principal quantum number n = 5, which means it has 5 electrons shell) of Periodic table.

Electron configuration of antimony atom: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p³.

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What volume of concentrated (10.2 M) HCl would be required to prepare 1.11 x 104 mL of 1.5 M HC1? Enter your answer in scientifi
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When we want to prepare a dilute solution from a concentrated one, we can use the dilution rule to find out the required volume to dilute. This rule states:

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In this case, we want to find out V₁:

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