Atoms and Elements: Foundations

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Explore atomic structure and periodic basics.

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Elsa Dowdy

United States

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Atoms and Elements: FoundationsVersion en ligne Explore atomic structure and periodic basics. par Elsa Dowdy 1 Introduction to Atomic Theory Atoms are the building blocks of matter. Early ideas evolved into Dalton’s theory, shaping our understanding of chemical change and conservation of mass. 2 Dalton’s Atomic Theory Dalton proposed five postulates: matter is made of atoms; atoms are indivisible; all atoms of an element are identical; compounds are formed by combining atoms; and atoms rearrange in reactions. 3 Atoms vs. Ions Neutral atoms have equal protons and electrons. When electrons are gained or lost, particles become ions with positive or negative charges, altering properties. 4 Atomic versus Mass Number The atomic number (Z) counts protons, defining the element. The mass number (A) equals protons plus neutrons, indicating total nucleons. 5 Neutral Atoms and Electron Count In neutral atoms, Z equals the number of electrons. If electrons are removed or added, the balance shifts, creating ions with charges. 6 Isotopes and Atomic Mass Most elements exist as isotopic mixtures. The atomic mass on the periodic table is a weighted average of isotopes’ masses. 7 Subatomic Particles Protons (mass ~1 amu, +1), neutrons (~1 amu, 0), and electrons (~0.00055 amu, −1) compose atoms and define their behavior in reactions. 8 Electron Discovery & Models J.J. Thomson’s cathode-ray experiments revealed electrons as the first subatomic particle, leading to early atomic models and the plum pudding idea. 9 Nucleus and Rutherford Rutherford’s gold-foil experiments showed a dense nucleus at the center, with most atom volume being empty space and electrons surrounding the nucleus.

Atoms and Elements: FoundationsVersion en ligne

Explore atomic structure and periodic basics.

par Elsa Dowdy

Introduction to Atomic Theory

Atoms are the building blocks of matter. Early ideas evolved into Dalton’s theory, shaping our understanding of chemical change and conservation of mass.

Dalton’s Atomic Theory

Dalton proposed five postulates: matter is made of atoms; atoms are indivisible; all atoms of an element are identical; compounds are formed by combining atoms; and atoms rearrange in reactions.

Atoms vs. Ions

Neutral atoms have equal protons and electrons. When electrons are gained or lost, particles become ions with positive or negative charges, altering properties.

Atomic versus Mass Number

The atomic number (Z) counts protons, defining the element. The mass number (A) equals protons plus neutrons, indicating total nucleons.

Neutral Atoms and Electron Count

In neutral atoms, Z equals the number of electrons. If electrons are removed or added, the balance shifts, creating ions with charges.

Isotopes and Atomic Mass

Most elements exist as isotopic mixtures. The atomic mass on the periodic table is a weighted average of isotopes’ masses.

Subatomic Particles

Protons (mass ~1 amu, +1), neutrons (~1 amu, 0), and electrons (~0.00055 amu, −1) compose atoms and define their behavior in reactions.

Electron Discovery & Models

J.J. Thomson’s cathode-ray experiments revealed electrons as the first subatomic particle, leading to early atomic models and the plum pudding idea.

Nucleus and Rutherford

Rutherford’s gold-foil experiments showed a dense nucleus at the center, with most atom volume being empty space and electrons surrounding the nucleus.

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Atoms and Elements: Foundations

Présentation

À propos de cette activité

Créé par

Téléchargez la version pour jouer sur papier

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Atoms and Elements: FoundationsVersion en ligne

par Elsa Dowdy

Introduction to Atomic Theory

Dalton’s Atomic Theory

Atoms vs. Ions

Atomic versus Mass Number

Neutral Atoms and Electron Count

Isotopes and Atomic Mass

Subatomic Particles

Electron Discovery & Models

Nucleus and Rutherford

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