Module 17 Elements and Their Properties

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What are alkaline earth metals?

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Alkaline earth metals are the elements found in group 2 of the periodic table, which include beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). They are known for being reactive and having two electrons in their outermost shell.

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Which elements are classified as alkaline earth metals?

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The alkaline earth metals include magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

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What is the period number of an element?

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The period number of an element indicates the number of energy levels or shells that the electrons occupy. For example, phosphorus (P) is in period 3, meaning it has three energy levels.

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What are noble gases?

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Noble gases are the elements in group 18 of the periodic table, known for their lack of reactivity due to having a full valence shell. The noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

Front

What is the significance of group numbers in the periodic table?

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Group numbers in the periodic table indicate the number of valence electrons in the outer shell of the elements in that group, which influences their chemical properties.

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What is the difference between alkali metals and alkaline earth metals?

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Alkali metals are found in group 1 and have one electron in their outer shell, making them highly reactive. Alkaline earth metals are in group 2 and have two electrons in their outer shell, making them less reactive than alkali metals.

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What is the general trend in reactivity for alkaline earth metals?

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The reactivity of alkaline earth metals increases as you move down the group in the periodic table, with beryllium being the least reactive and radium being the most reactive.

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What is the atomic structure of phosphorus?

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Phosphorus has an atomic number of 15, meaning it has 15 protons and typically 15 electrons. Its electron configuration is 1s² 2s² 2p⁶ 3s² 3p³.

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How many energy levels does an element in period 4 have?

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An element in period 4 has four energy levels or shells for its electrons.

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What are the properties of noble gases?

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Noble gases are colorless, odorless, and tasteless gases at room temperature. They have very low chemical reactivity due to their full valence electron shells.