Domanda del libro di testo
(b) Using the mass of the proton from Table 2.1 and assuming its diameter is 1.0 * 10-15 m, calculate the density of a proton in g>cm3.
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Ch.2 - Atoms, Molecules, and Ions
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
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TOC.tableOfContents
- Ch.1 - Introduction: Matter, Energy, and Measurement177
- Ch.2 - Atoms, Molecules, and Ions231
- Ch.3 - Chemical Reactions and Reaction Stoichiometry216
- Ch.4 - Reactions in Aqueous Solution189
- Ch.5 - Thermochemistry175
- Ch.6 - Electronic Structure of Atoms168
- Ch.7 - Periodic Properties of the Elements150
- Ch.8 - Basic Concepts of Chemical Bonding177
- Ch.9 - Molecular Geometry and Bonding Theories200
- Ch.10 - Gases179
- Ch.11 - Liquids and Intermolecular Forces113
- Ch.12 - Solids and Modern Materials154
- Ch.13 - Properties of Solutions157
- Ch.14 - Chemical Kinetics199
- Ch.15 - Chemical Equilibrium128
- Ch.16 - Acid-Base Equilibria164
- Ch.17 - Additional Aspects of Aqueous Equilibria163
- Ch.18 - Chemistry of the Environment105
- Ch.19 - Chemical Thermodynamics164
- Ch.20 - Electrochemistry171
- Ch.21 - Nuclear Chemistry122
- Ch.22 - Chemistry of the Nonmetals82
- Ch.23 - Transition Metals and Coordination Chemistry79
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry16
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Non è quello che usi tu?Cambia libro di testo
Capitolo 2, Problema 92a
Identify the element represented by each of the following symbols and give the number of protons and neutrons in each: (a) 7433X
Guida verificata passo dopo passo1
Step 1: The atomic number (the subscript) represents the number of protons in an atom. In this case, the atomic number is 33, which corresponds to the element Arsenic (As) in the periodic table.
Step 2: The atomic mass number (the superscript) represents the total number of protons and neutrons in an atom. In this case, the atomic mass number is 74.
Step 3: To find the number of neutrons, subtract the atomic number (number of protons) from the atomic mass number. In this case, 74 (atomic mass number) - 33 (atomic number) = 41.
Step 4: Therefore, the element represented by the symbol 7433X is Arsenic (As), which has 33 protons and 41 neutrons.
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Atomic Number
The atomic number of an element is the number of protons found in the nucleus of an atom. It uniquely identifies an element and determines its position on the periodic table. In the notation <sup>74</sup><sub>33</sub>X, the subscript '33' represents the atomic number, indicating that the element has 33 protons.
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Percorso guidato
02:10
Atom Structure
Mass Number
The mass number of an atom is the total number of protons and neutrons in its nucleus. It is represented by the superscript in the notation <sup>74</sup><sub>33</sub>X, where '74' is the mass number. To find the number of neutrons, subtract the atomic number from the mass number: neutrons = mass number - atomic number.
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Percorso guidato
02:19Atomic Mass
Isotopes
Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons. This results in different mass numbers for the isotopes of the same element. In the case of <sup>74</sup><sub>33</sub>X, knowing the mass number allows us to identify the specific isotope of the element with atomic number 33, which is arsenic.
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04:36Isotopes
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The nucleus of 6Li is a powerful absorber of neutrons. It exists in the naturally occurring metal to the extent of 7.5%. In the era of nuclear deterrence, large quantities of lithium were processed to remove 6Li for use in hydrogen bomb production. The lithium metal remaining after removal of 6Li was sold on the market. (b) The atomic masses of 6Li and 7Li are 6.015122 and 7.016004 u, respectively. A sample of lithium depleted in the lighter isotope was found on analysis to contain 1.442% 6Li. What is the average atomic weight of this sample of the metal?
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Domanda del libro di testo
(a) Assuming the dimensions of the nucleus and atom shown in Figure 2.10, what fraction of the volume of the atom is taken up by the nucleus?
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Domanda del libro di testo
The nucleus of 6Li is a powerful absorber of neutrons. It exists in the naturally occurring metal to the extent of 7.5%. In the era of nuclear deterrence, large quantities of lithium were processed to remove 6Li for use in hydrogen bomb production. The lithium metal remaining after removal of 6Li was sold on the market. (a) What are the compositions of the nuclei of 6Li and 7Li?
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Domanda del libro di testo
Very small semiconductor crystals, composed of approximately
1000 to 10,000 atoms, are called quantum dots.
Quantum dots made of the semiconductor CdSe are now
being used in electronic reader and tablet displays because
they emit light efficiently and in multiple colors, depending
on dot size. The density of CdSe is 5.82 g/cm3.
(b) CdSe quantum dots that are 2.5 nm in diameter emit
blue light upon stimulation. Assuming that the dot is a
perfect sphere and that the empty space in the dot can
be neglected, calculate how many Cd atoms are in one
quantum dot of this size.
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Domanda del libro di testo
Identify the element represented by each of the following symbols and give the number of protons and neutrons in each: (b) 12753X (c) 8636X (d) 6730X
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