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Ch. 2 - Chemical Principles
Chapter 2, Problem 2.2a

DRAW IT Diagram the electronic configuration of a carbon atom.

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1
Identify the atomic number of carbon, which is 6, indicating it has 6 electrons.
Understand that electrons fill orbitals in a specific order: 1s, 2s, 2p, 3s, 3p, etc., following the Aufbau principle.
Start filling the orbitals with electrons: the first two electrons will fill the 1s orbital.
Place the next two electrons in the 2s orbital.
Distribute the remaining two electrons in the 2p orbital, ensuring each p orbital gets one electron before pairing, according to Hund's rule.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Atomic Structure

The atomic structure of an element consists of protons, neutrons, and electrons. In a carbon atom, there are six protons and six neutrons in the nucleus, with six electrons orbiting around the nucleus. Understanding this structure is essential for visualizing how electrons are arranged in energy levels.
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Electron Configuration

Electron configuration describes the distribution of electrons in an atom's orbitals. For carbon, the electron configuration is 1s² 2s² 2p², indicating that two electrons occupy the first energy level (1s) and four electrons occupy the second level (2s and 2p). This arrangement is crucial for understanding chemical bonding and reactivity.
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Orbital Diagrams

Orbital diagrams visually represent the arrangement of electrons in an atom's orbitals. Each orbital can hold a maximum of two electrons with opposite spins. For carbon, the diagram would show two electrons in the 1s orbital, two in the 2s orbital, and two in the 2p orbitals, illustrating how electrons are paired and distributed among available energy levels.
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Related Practice
Textbook Question

What is a chemical element?

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Textbook Question

Radioisotopes are frequently used to label molecules in a cell. The fate of atoms and molecules in a cell can then be followed. This process is the basis for questions 1-3.


Assume E. coli bacteria are grown in a nutrient medium containing the radioisotope ¹⁶N. After a 48-hour incubation period, the ¹⁶N would most likely be found in the E. coli’s

a. carbohydrates.

b. lipids.

c. proteins.

d. water.

e. none of the above

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Textbook Question

Classify each of the molecules on the left as an acid, base, or salt. The dissociation products of the molecules are shown to help you.


MgSO₄ → Mg²⁺ + SO²₄⁻

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Textbook Question

Radioisotopes are frequently used to label molecules in a cell. The fate of atoms and molecules in a cell can then be followed. This process is the basis for questions 1-3.


If Pseudomonas bacteria are supplied with radioactively labeled cytosine, after a 24-hour incubation period this cytosine would most likely be found in the cells’

a. carbohydrates.

b. DNA.

c. lipids.

d. water.

e. proteins.

116
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Textbook Question

What type of bond holds the following atoms together?

a. Li+ and Cl- in LiCl

b. carbon and oxygen atoms in methanol

c. oxygen atoms in O₂

d. a hydrogen atom of one nucleotide to a nitrogen or oxygen atom of another nucleotide in:

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107
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Textbook Question

Radioisotopes are frequently used to label molecules in a cell. The fate of atoms and molecules in a cell can then be followed. This process is the basis for questions 1-3.


If E. coli were grown in a medium containing the radioactive isotope ³²P, the ³²P would be found in all of the following molecules of the cell except

a. ATP.

b. carbohydrates.

c. DNA.

d. plasma membrane.

e. complex lipids.

217
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