2.E: Elements, Atoms, and the Periodic Table (Exercises)
- Page ID
- 165427
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If the atomic radius of sodium atoms is 1.86 × 10−10 m, how many sodium atoms are needed to make a line that is 1.00 cm in length?
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What might be the electron configuration of K+, an atom that has lost an electron?
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The electron configuration of the Ti atom is 1s22s22p63s23p64s23d2. What is the valence shell electron configuration of Ti?
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The electron configuration of the Ge atom is 1s22s22p63s23p64s23d104p2. What is the valence shell electron configuration of Ge?
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What is the mass of an electron in atomic mass units?
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A sample of the nonexistent element mythium consists of 25.59% of an isotope with mass number 580, 32.74% of an isotope with mass number 582, and 41.67% of an isotope with mass number 581. What is the atomic mass of mythium?
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The compound that sodium makes with chlorine has sodium and chlorine atoms in a 1:1 ratio. Name two other elements that should make a compound having a 1:1 ratio of atoms with sodium.
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The compound that magnesium makes with oxygen has magnesium to oxygen atoms in a 1:1 ratio. Name two other elements that should make a compound having a 1:1 ratio of atoms with magnesium.
Answers
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2.69 × 107 atoms
2. 1s22s22p63s23p6
3. 4s2
4. 4s24p2
5. 0.0005484 u
6. 581.1 u
8. sulfur and selenium (answers will vary)