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Chemistry

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Electron Review: Valence Electron and Valency
Electron Review: Valence Electron and Valency 150 150 SchoolTutoring Academy

Valence electron is an electron of an atom located in the outermost shell of the atom and can be transferred to or shared with another atom. It is most likely…

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Electron Configuation
Electron Configuation 150 150 SchoolTutoring Academy

Electron configuration was first conceived of under the Bohr model of the atom. Electrons revolve around the positively charged nucleus (made of neutrons and protons) in orbits called shells. Each…

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Chemistry Review: Electron Shells and Subshells
Chemistry Review: Electron Shells and Subshells 150 150 SchoolTutoring Academy

An atom is a basic building block of matter around us. Each atom is consists of the fundamental particles: negatively charged electron, positively charged proton and neutral neuron. Shells Electrons…

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Physical and Chemical Changes
Physical and Chemical Changes 150 150 SchoolTutoring Academy

Physical changes Physical changes are changes that do not affect the chemical composition of a substance. No new product is formed during physical change. Physical changes are concerned with energy…

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Atoms: The Basic Building Blocks
Atoms: The Basic Building Blocks 150 150 SchoolTutoring Academy

Democritus, a Greek philosopher, developed the idea of atoms. But his idea was dismissed by other Greek philosophers.  In 1800’s, John Dalton, an English chemist performed experiments with various chemicals…

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States of Matter: Solids, Liquids, and Gases
States of Matter: Solids, Liquids, and Gases 150 150 SchoolTutoring Academy

Matter is anything that occupies space and has mass. Solid, liquid and gas are the most common forms (or states) of matter. Solid A solid has a certain shape and…

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Chemistry Concepts: Atomic Symbol, Atomic Number, Atomic Mass
Chemistry Concepts: Atomic Symbol, Atomic Number, Atomic Mass 150 150 SchoolTutoring Academy

An atom is a basic building block of matter around us. Each atom is consists of the fundamental particles. Electron is negatively charged, proton is positive and neutron is neutral.…

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