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Matter whose composition does not change from one sample to another made of a single type of atom or molecule all samples have the same characteristics.

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pure substance

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(LEC) PHARMACEUTICAL INORGANIC CHEMISTRY (1ST SEMESTER) - Leaderboard

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(LEC) PHARMACEUTICAL INORGANIC CHEMISTRY (1ST SEMESTER) - Details

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🇬🇧		🇬🇧

Matter whose composition does not change from one sample to another made of a single type of atom or molecule all samples have the same characteristics.

Pure substance

Matter whose composition may vary from one sample to another two or more types of atoms or molecules combined in variable proportions composition varies, different samples have different characteristics.

Mixture

Pure substances that cannot be decomposed into simpler substances by chemical reactions

Elements

Substances that can be decomposed

Compounds

Bohr's atomic model is also called

The planetary model

"Alpha particles, Gold Foil Experiment" discovery of alpha particles, positively charged particles emitted from radioactive elements Devised an experiment to investigate the structure of positive and negative charges in the atom concluded that an atom had a small, dense, positively charged center that repelled its positively charged “bullets.” He called the center of the atom the “nucleus” The nucleus is tiny compared to the atom as a whole.

Ernest Rutherford (1871 - 1937)

The first credited for the discovery of the atom

Democritus (400 B.C.E)

Proposed the Atomic Theory of Matter in 1803 Solid Sphere Model or Bowling Ball Model

John Dalton

Negatively charged electrons (raisins or blueberries) are surrounded by a positively charged "pudding" (or muffin) Proposed in 1904 Plum Pudding Model or Blueberry Muffin Model

J.j Thomson Atomic Model

Discovered the neutron in 1932

James Chadwick

Canal Rays and Protons (1886) He noted streams of positively charged particles in cathode rays in 1886 Canal Rays must be positive

Eugene Goldstein

Discovery of the Electron

J.J Thomson

Father of Modern Chemistry

Antoine-Laurent Lavoisier

Meyer and Mendeleev arranged the periodic table according to

Atomic weights

Father of Modern Periodic Table.

Henry Moseley

Atoms that have the same atomic number (Z) but different mass numbers (A).

Isotopes

Periodic Trend: Ionization energy. From Bottom to Top. increases or decreases?

Increases

Bohr's atomic model is also called

The planetary model

He used the Law of Octaves in arranging the periodic table.

John Newlands

Is a variant of a substance consisting of only one type of atom. a new molecular configuration with new physical properties

Allotrope

Developed "Triads", groups of 3 elements with similar properties.

Johann Dobereiner

"Triads", groups of 3 elements with similar properties.

1 Lithium, Sodium and Potassium 2 Calcium, Strontium and Barium 3 Chlorine, Bromine and Iodine 4 Sulfur, Selenium and Tellurium