Elements and the Periodic Table

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

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What is a compound?

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A compound is a substance formed when two or more different elements are chemically bonded together. For example, water (H2O) is a compound made of hydrogen and oxygen.

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded. Each substance retains its own properties. For example, a salad is a mixture.

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What is the periodic table?

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The periodic table is a tabular arrangement of all known chemical elements, organized by increasing atomic number and grouped by similar properties.

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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.

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What is the symbol for Oxygen?

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The symbol for Oxygen is O.

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What are noble gases?

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Noble gases are a group of elements in Group 18 of the periodic table that are characterized by their lack of reactivity due to having a full valence shell of electrons.

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What is the symbol for Iron?

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The symbol for Iron is Fe.

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How many atoms of Oxygen are in the compound CuSO4?

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There are 4 atoms of Oxygen in the compound CuSO4.

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What is a molecule?

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A molecule is the smallest unit of a chemical compound that retains its chemical properties, consisting of two or more atoms bonded together.