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- https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/04%3A_Atomic_Structure/4.16%3A_Atomic_NumberThis page explores individuality through identifiers such as cell phone numbers and DNA, then shifts to atomic theory, explaining how atomic numbers define elements based on proton counts. It emphasiz...This page explores individuality through identifiers such as cell phone numbers and DNA, then shifts to atomic theory, explaining how atomic numbers define elements based on proton counts. It emphasizes the organization of the periodic table for predicting element properties and notes that atoms are neutral, with equal numbers of protons and electrons, underscoring the foundational aspect of atomic structure.
- https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/02%3A_Matter_and_Change/2.11%3A_ElementsThis page discusses Sherlock Holmes, a fictional British detective noted for his keen insights, and the concept of elements, which are the simplest forms of matter. There are 118 known elements, inclu...This page discusses Sherlock Holmes, a fictional British detective noted for his keen insights, and the concept of elements, which are the simplest forms of matter. There are 118 known elements, including 98 naturally occurring and 20 synthesized, with examples like oxygen, iron, and gold. Elements differ in value, with gold being highly prized compared to cheaper elements such as aluminum.
- https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/10%3A_The_Mole/10.03%3A_Molar_MassThis page explains how to calculate the amount of a substance needed for a solution based on its molar mass, using carbon dioxide and calcium nitrate as examples. It highlights the relationship betwee...This page explains how to calculate the amount of a substance needed for a solution based on its molar mass, using carbon dioxide and calcium nitrate as examples. It highlights the relationship between moles and grams and underscores the importance of molar mass for accurate measurements in solution preparation. The page also includes review questions to help reinforce understanding of molar mass and its calculations.
- https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/06%3A_The_Periodic_Table/6.18%3A_Electron_ShieldingThis page discusses roller derby, where a jammer scores points by passing opponents while blockers try to stop them. It also explains electron shielding in atoms, detailing how inner electrons affect ...This page discusses roller derby, where a jammer scores points by passing opponents while blockers try to stop them. It also explains electron shielding in atoms, detailing how inner electrons affect attraction to outer electrons and influence ionization energy, with examples from lithium and aluminum, as well as variations in ionization energy across groups 13-15 and 15-16, highlighting the effects of electron configuration and pairing.
- https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/06%3A_The_Periodic_TableThis page discusses trends in the periodic table, particularly how character increases up a group and the transitions between metals and nonmetals. It highlights the connection between electronic stru...This page discusses trends in the periodic table, particularly how character increases up a group and the transitions between metals and nonmetals. It highlights the connection between electronic structures and the properties of elements, as well as the historical context that has influenced our understanding of the periodic table.
