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- https://chem.libretexts.org/Courses/Grand_Rapids_Community_College/CHM_120%3A_Survey_of_General_Chemistry_(Crandell)/02%3A_Measurements_and_the_Periodic_Table/2.06%3A_Atomic_Structure_and_Symbolism/2.6.02%3A_Extra-Evolution_of_Atomic_TheoryAlthough no one has actually seen the inside of an atom, experiments have demonstrated much about atomic structure. Thomson’s cathode ray tube showed that atoms contain small, negatively charged parti...Although no one has actually seen the inside of an atom, experiments have demonstrated much about atomic structure. Thomson’s cathode ray tube showed that atoms contain small, negatively charged particles called electrons. Millikan discovered that there is a fundamental electric charge—the charge of an electron. Rutherford’s gold foil experiment showed that atoms have a small, dense, positively charged nucleus; the positively charged particles within the nucleus are called protons.
- https://chem.libretexts.org/Courses/Duke_University/CHEM_210D%3A_Modern_Applications_of_Chemistry/3%3A_Textbook-_Modern_Applications_of_Chemistry/02%3A_Nuclear_Chemistry/2.04%3A_IsotopesThe presence of neutrons in atomic nuclei accounts for the occurrence of isotopes— samples of an element whose atoms contain different numbers of neutrons and hence exhibit different "nuclidic masses"...The presence of neutrons in atomic nuclei accounts for the occurrence of isotopes— samples of an element whose atoms contain different numbers of neutrons and hence exhibit different "nuclidic masses". The nuclidic mass is the mass of a "nuclide", where a nuclide is the term used for any atom whose nuclear composition (Number of protons and neutrons) is defined.
- https://chem.libretexts.org/Courses/Mt._San_Antonio_College/Chem_10_-_Chemistry_for_Allied_Health_Majors_(1st_semester)/03%3A_Elements_Atoms_and_the_Periodic_Table/3.04%3A_Isotopes_and_Atomic_WeightElements can be identified by their atomic number and mass number. Isotopes are atoms of the same element that have different masses. Atoms have a mass that is based largely on the number of protons ...Elements can be identified by their atomic number and mass number. Isotopes are atoms of the same element that have different masses. Atoms have a mass that is based largely on the number of protons and neutrons in their nucleus.
- https://chem.libretexts.org/Bookshelves/General_Chemistry/Chemistry_2e_(OpenStax)/02%3A_Atoms_Molecules_and_Ions/2.02%3A_Evolution_of_Atomic_TheoryAlthough no one has actually seen the inside of an atom, experiments have demonstrated much about atomic structure. Thomson’s cathode ray tube showed that atoms contain small, negatively charged parti...Although no one has actually seen the inside of an atom, experiments have demonstrated much about atomic structure. Thomson’s cathode ray tube showed that atoms contain small, negatively charged particles called electrons. Millikan discovered that there is a fundamental electric charge—the charge of an electron. Rutherford’s gold foil experiment showed that atoms have a small, dense, positively charged nucleus; the positively charged particles within the nucleus are called protons.
- https://chem.libretexts.org/Courses/Louisville_Collegiate_School/General_Chemistry/LibreTexts_Louisville_Collegiate_School_Chapters_02%3A_Atoms_Molecules_and_Ions/LibreTexts%2F%2FLouisville_Collegiate_School%2F%2FChapters%2F%2F02%3A_Atoms%2C_Molecules%2C_and_Ions%2F%2F2.2%3A_Evolution_of_Atomic_TheoryAlthough no one has actually seen the inside of an atom, experiments have demonstrated much about atomic structure. Thomson’s cathode ray tube showed that atoms contain small, negatively charged parti...Although no one has actually seen the inside of an atom, experiments have demonstrated much about atomic structure. Thomson’s cathode ray tube showed that atoms contain small, negatively charged particles called electrons. Millikan discovered that there is a fundamental electric charge—the charge of an electron. Rutherford’s gold foil experiment showed that atoms have a small, dense, positively charged nucleus; the positively charged particles within the nucleus are called protons.
- https://chem.libretexts.org/Courses/University_of_Missouri/MU%3A__1330H_(Keller)/02._Atoms_Molecules_and_Ions/2.3%3A_The_Modern_View_of_Atomic_StructureEach atom of an element contains the same number of protons, which is the atomic number (Z). Neutral atoms have the same number of electrons and protons. Atoms of an element that contain different num...Each atom of an element contains the same number of protons, which is the atomic number (Z). Neutral atoms have the same number of electrons and protons. Atoms of an element that contain different numbers of neutrons are called isotopes. Each isotope of a given element has the same atomic number but a different mass number (A), which is the sum of the numbers of protons and neutrons. The relative masses of atoms are reported using the atomic mass unit (amu).
- https://chem.libretexts.org/Courses/University_of_Kentucky/UK%3A_General_Chemistry/02%3A_Atoms_Molecules_and_Ions/2.2%3A_Evolution_of_Atomic_TheoryAlthough no one has actually seen the inside of an atom, experiments have demonstrated much about atomic structure. Thomson’s cathode ray tube showed that atoms contain small, negatively charged parti...Although no one has actually seen the inside of an atom, experiments have demonstrated much about atomic structure. Thomson’s cathode ray tube showed that atoms contain small, negatively charged particles called electrons. Millikan discovered that there is a fundamental electric charge—the charge of an electron. Rutherford’s gold foil experiment showed that atoms have a small, dense, positively charged nucleus; the positively charged particles within the nucleus are called protons.
- https://chem.libretexts.org/Courses/Monterey_Peninsula_College/CHEM_30A%3A_Introduction_to_Chemistry_for_Health_Sciences/11%3A_Nuclear_Reactions/11.01%3A_IsotopesIsotopes are atoms of the same element that differ in the amount of neutrons and atomic mass. Almost all elements on the periodic table have at least two different natural isotopes. Many elements have...Isotopes are atoms of the same element that differ in the amount of neutrons and atomic mass. Almost all elements on the periodic table have at least two different natural isotopes. Many elements have synthetic isotopic forms that have been made by nuclear chemists and/or physicists. Chemically, isotopes appear to be the same. For example, the two most abundant forms of uranium look physically the same and react to other materials in a similar manner.
- https://chem.libretexts.org/Workbench/OpenStax_Chemistry_Remixed%3A_Clovis_Community_College/02%3A_Atoms_Molecules_and_Ions/2.03%3A_Evolution_of_Atomic_TheoryAlthough no one has actually seen the inside of an atom, experiments have demonstrated much about atomic structure. Thomson’s cathode ray tube showed that atoms contain small, negatively charged parti...Although no one has actually seen the inside of an atom, experiments have demonstrated much about atomic structure. Thomson’s cathode ray tube showed that atoms contain small, negatively charged particles called electrons. Millikan discovered that there is a fundamental electric charge—the charge of an electron. Rutherford’s gold foil experiment showed that atoms have a small, dense, positively charged nucleus; the positively charged particles within the nucleus are called protons.
- https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Supplemental_Modules_and_Websites_(Inorganic_Chemistry)/Descriptive_Chemistry/Elements_Organized_by_Block/1_s-Block_Elements/Group__2_Elements%3A_The_Alkaline_Earth_Metals/Z038_Chemistry_of_Strontium_(Z38)Strontium is a group 2 element that does not occur as a free element due to its extreme reactivity with oxygen and water. It occurs naturally only in compounds with other elements such as strontianite...Strontium is a group 2 element that does not occur as a free element due to its extreme reactivity with oxygen and water. It occurs naturally only in compounds with other elements such as strontianite. It is softer than calcium and decomposes water more vigorously. It has a silver appearance but then turns yellow with the formation of oxide. Strontium is named after the Scottish village on Strontian.
- https://chem.libretexts.org/Courses/City_College_of_San_Francisco/CCSF_Chemistry_Resources/01%3A_CHE_101_-_Introduction_to_General_Chemistry/1.01%3A_Atoms_and_the_Periodic_Table/1.1.00%3A_Evolution_of_Atomic_TheoryAlthough no one has actually seen the inside of an atom, experiments have demonstrated much about atomic structure. Thomson’s cathode ray tube showed that atoms contain small, negatively charged parti...Although no one has actually seen the inside of an atom, experiments have demonstrated much about atomic structure. Thomson’s cathode ray tube showed that atoms contain small, negatively charged particles called electrons. Millikan discovered that there is a fundamental electric charge—the charge of an electron. Rutherford’s gold foil experiment showed that atoms have a small, dense, positively charged nucleus; the positively charged particles within the nucleus are called protons.
