A2 Chemistry Test on Periodic Trends

Noble gases are a group of chemical elements that are odorless, colorless, monatomic gases with very low chemical reactivity. Examples include Helium, Neon, Argon, Krypton, Xenon, and Radon.

Group 1 of the periodic table is known as the alkali metals. This group includes elements like Lithium (Li), Sodium (Na), and Potassium (K).

Noble gases are characterized by their full valence electron shell, making them very stable and nonreactive. They do not readily form chemical compounds.

The group of elements in group IA is called the alkali metals.

Sodium (Na) has the lowest electronegativity in Period 3.

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. It is a key factor in determining how atoms interact in chemical bonds.

Halogens are the elements found in Group 17 of the periodic table. They are known for their high reactivity and include Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At).

The group number indicates the number of valence electrons in the elements of that group, which influences their chemical properties and reactivity.

The atomic radius generally decreases across a period from left to right due to increasing nuclear charge, which pulls the electrons closer to the nucleus.

Ionization energy generally decreases down a group because the outer electrons are further from the nucleus and are shielded by inner electrons, making them easier to remove.