Periodic table

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What is the Periodic Table?

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A tabular arrangement of chemical elements, organized by increasing atomic number, electron configuration, and recurring chemical properties.

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What are alkali metals?

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The group of elements in Group 1 of the Periodic Table, characterized by having one electron in their outermost shell. Examples include Lithium (Li), Sodium (Na), and Potassium (K).

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What is a halogen?

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Elements found in Group 17 of the Periodic Table, known for their reactivity and tendency to form salts with metals. Examples include Fluorine (F), Chlorine (Cl), and Bromine (Br).

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What is the name of Group 2 in the Periodic Table?

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Alkaline Earth Metals.

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What is a period in the Periodic Table?

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A horizontal row of elements in the Periodic Table, which indicates the number of electron shells an atom has.

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What are transition metals?

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Elements found in Groups 3-12 of the Periodic Table, known for their ability to form variable oxidation states and colored compounds.

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What is the atomic number?

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The number of protons in the nucleus of an atom, which determines the element's identity.

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What is an isotope?

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Atoms of the same element that have the same number of protons but different numbers of neutrons.

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What is the significance of the zig-zag line on the Periodic Table?

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It separates metals from nonmetals and indicates the position of metalloids.

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What are noble gases?

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Elements in Group 18 of the Periodic Table, known for their lack of reactivity due to having a full valence shell. Examples include Helium (He) and Neon (Ne).