Quiz 2 - Periodic Table & Atomic Mass | The Periodic Table and Atomic Mass

The modern periodic table arranges elements in order of increasing atomic number, which reflects the number of protons in the nucleus of an atom.

Noble gases are found in Group 18 of the periodic table and are characterized by their lack of reactivity due to having a complete valence shell of electrons.

Silicon is a metalloid, which means it has properties intermediate between those of metals and nonmetals.

Atomic mass is the weighted average mass of an atom of an element, measured in atomic mass units (amu).

Avogadro's number is 6.022 × 10²³, which represents the number of atoms, molecules, or particles in one mole of a substance.

The mole is a fundamental unit in chemistry used to count particles (atoms, molecules, ions) and is equivalent to Avogadro's number of particles.

The molar mass of water is calculated by adding the molar masses of 2 hydrogen atoms (2 × 1 g/mol) and 1 oxygen atom (16 g/mol), giving a total of 18 g/mol.

The molar mass of CO₂ is 44 g/mol (12 g/mol for carbon and 16 g/mol for each oxygen), so 44 grams of CO₂ is equivalent to 1 mole.

Iron is classified as a transition metal and is located in the d-block of the periodic table, known for its ability to form various oxidation states.

Elements in the same group of the periodic table have the same number of valence electrons, which gives them similar chemical properties.