Periodic Table/Elements/Compound Review

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that determine its chemical properties and reactivity.

Front

Why are noble gases unreactive?

Back

Noble gases have eight valence electrons, which makes them stable and unreactive under normal conditions.

Front

What does the atomic mass of an element represent?

Back

The atomic mass represents the average mass of an element's atoms, measured in atomic mass units (amu).

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

Which group of elements is known as alkali metals?

Back

Alkali metals are the elements in Group 1 of the periodic table, including lithium (Li), sodium (Na), and potassium (K).

Front

What are halogens?

Back

Halogens are the elements in Group 17 of the periodic table, known for being highly reactive nonmetals, including fluorine (F) and chlorine (Cl).

Front

How do you determine the number of valence electrons in an element?

Back

The number of valence electrons can be determined by the group number of the element in the periodic table.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements chemically bond together.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms bonded together.

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties.