Atomic Number & Groups

Front

What is the atomic number of an element?

Back

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

Front

How are valence electrons related to the group number of an element?

Back

The number of valence electrons is equal to the group number for main group elements in the periodic table.

Front

Which elements are found in Group 18 of the periodic table?

Back

The elements in Group 18, also known as the noble gases, are Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn).

Front

What is the most reactive group of nonmetals?

Back

Group 17, also known as the halogens, is the most reactive group of nonmetals.

Front

Which elements are considered halogens?

Back

The halogens include Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At).

Front

What are alkali metals?

Back

Alkali metals are the elements in Group 1 of the periodic table, which include Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr).

Front

What is the reactivity trend of alkali metals?

Back

Alkali metals increase in reactivity as you move down the group in the periodic table.

Front

What is the significance of valence electrons in chemical bonding?

Back

Valence electrons are the outermost electrons of an atom and are involved in forming chemical bonds with other atoms.

Front

Which elements are the most reactive nonmetals?

Back

The most reactive nonmetals are Fluorine (F), Chlorine (Cl), and Bromine (Br).

Front

What is the general trend of reactivity among nonmetals?

Back

Reactivity of nonmetals generally decreases as you move down a group in the periodic table.