Name an element in the third period (row) of the periodic table with the following: d. two valence electrons

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Step 1: Understand that the periodic table is organized into periods (rows) and groups (columns). Elements in the same group have the same number of valence electrons, which are the electrons in the outermost shell of an atom that are involved in chemical reactions.

Step 2: The third period of the periodic table includes the elements Sodium (Na) to Argon (Ar).

Step 3: The number of valence electrons an element has corresponds to its group number. For example, elements in Group 1 (like Sodium) have one valence electron, elements in Group 2 (like Magnesium) have two valence electrons, and so on.

Step 4: Since we are looking for an element in the third period with two valence electrons, we should look at the element in Group 2 of the third period.

Step 5: The element in Group 2 of the third period is Magnesium (Mg). Therefore, Magnesium is the element in the third period of the periodic table with two valence electrons.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Periodic Table Structure

The periodic table is organized into rows (periods) and columns (groups) based on atomic number and electron configuration. Elements in the same period have the same number of electron shells, while those in the same group share similar chemical properties due to their valence electron configurations.

Valence Electrons

Valence electrons are the outermost electrons of an atom and are crucial in determining how an element reacts chemically. The number of valence electrons influences an element's bonding behavior and its placement in the periodic table, particularly in relation to its group.

Elements in the Third Period

The third period of the periodic table includes the elements sodium (Na), magnesium (Mg), aluminum (Al), silicon (Si), phosphorus (P), sulfur (S), chlorine (Cl), and argon (Ar). Among these, magnesium (Mg) is the only element with two valence electrons, as it is in group 2 of the periodic table.

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