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Chapter 2: Problem 22

What is the modern view of the structure of the atom?

Short Answer

Expert verified
The modern view of the atom's structure is based on the quantum mechanical model, which consists of a dense nucleus containing protons and neutrons, surrounded by an electron cloud in discrete energy levels, or orbitals. Electrons occupy these orbitals following the quantization of energy levels and the Aufbau principle, which involves filling orbitals starting at the lowest-energy level and moving upwards.

Step by step solution

01

Introduce the atom

An atom is the smallest unit of a chemical element that retains the chemical properties of that element. The modern view of the atom's structure is based on the quantum mechanical model.
02

Protons, neutrons, and electrons

Atoms consist of three main particles: protons, neutrons, and electrons. Protons carry a positive charge, neutrons have no charge (neutral), and electrons carry a negative charge.
03

Atomic nucleus

At the center of an atom is a dense core called the nucleus, composed of protons and neutrons. These are referred to as nucleons. The nucleus accounts for most of the atom's mass.
04

Electron cloud

Surrounding the nucleus is a cloud of electrons, which occupy specific regions called orbitals. The electrons are attracted to the positively charged protons in the nucleus but remain separated due to their energy levels and the electromagnetic force.
05

Quantization of energy levels

Electrons in an atom exist in specific energy levels, called shells or orbitals. These energy levels are quantized, meaning that electrons can only exist in certain discrete energy levels and not in between. Energy levels are denoted as n = 1, 2, 3, ... and generally follow the formula 2n^2 for the maximum number of electrons that can occupy each level.
06

Electron orbitals

Each energy level in an atom is divided into sublevels called orbitals. There are four types of orbitals: s, p, d, and f, each having a unique shape and orientation in space. Electrons occupy these orbitals in a specific order, following the Aufbau principle, which states that electrons fill orbitals starting at the lowest-energy level and moving upwards. Overview: The modern view of an atom's structure includes protons and neutrons in the atomic nucleus and electrons surrounding it in specific energy levels, or orbitals. The quantum mechanical model, which incorporates the quantization of energy levels and the Aufbau principle, best describes the atom's structure.

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Most popular questions from this chapter

Dalton assumed that all atoms of the same element were identical in all their properties. Explain why this assumption is not valid.

A reaction of 1 liter of chlorine gas \(\left(\mathrm{Cl}_{2}\right)\) with 3 liters of fluorine gas \(\left(\mathrm{F}_{2}\right)\) yields 2 liters of a gaseous product. All gas volumes are at the same temperature and pressure. What is the formula of the gaseous product?

For each of the following atomic numbers, use the periodic table to write the formula (including the charge) for the simple ion that the element is most likely to form in ionic compounds. a. 13 c. 56 e. 87 b. 34 d. \(\underline{7}\) f. 35

For lighter, stable isotopes, the ratio of the mass number to the atomic number is close to a certain value. What is the value? What happens to the value of the mass number to atomic number ratio as stable isotopes become heavier?

The contributions of J. J. Thomson and Ernest Rutherford led the way to today's understanding of the structure of the atom. What were their contributions?
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