Periodic Table and the elements properties

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state (like melting or boiling) and color changes.

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and includes processes like burning, rusting, and frying an egg.

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Who developed the first periodic table?

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Dmitri Mendeleev developed the first periodic table in 1869, organizing elements by atomic weight and noticing patterns in their properties.

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What are periods in the periodic table?

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Periods are the horizontal rows in the periodic table. Each period corresponds to the number of electron shells in the atoms of the elements in that row.

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What are groups in the periodic table?

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Groups are the vertical columns in the periodic table. Elements in the same group often have similar chemical properties due to having the same number of valence electrons.

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What happens when a metal reacts with oxygen and water?

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When a metal reacts with oxygen and water, it can form rust (tarnish), which is a chemical compound that results from the oxidation of the metal.

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What is rust?

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Rust is a reddish-brown oxide that forms on iron and its alloys when they react with oxygen and moisture in the environment.

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What is the atomic number?

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The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity and its position in the periodic table.

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What is the significance of the periodic table?

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The periodic table organizes all known elements based on their atomic number, electron configuration, and recurring chemical properties, allowing for predictions about element behavior.

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What is an example of a physical change?

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An example of a physical change is boiling water, where the water changes from liquid to gas but remains H2O.

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