Elements and the Periodic Table

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together. For example, water (H2O) is a compound made of hydrogen and oxygen.

Front

What are noble gases?

Back

Noble gases are a group of elements in Group 18 of the periodic table that are colorless, odorless, and have low reactivity. Examples include helium, neon, and argon.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include oxygen (O), hydrogen (H), and carbon (C).

Front

How many atoms of oxygen are in CuSO4?

Back

There are 4 atoms of oxygen in the compound CuSO4.

Front

Which element is not in C6H12O6?

Back

Helium is not in the compound C6H12O6; the elements present are carbon, hydrogen, and oxygen.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of chemical elements, organized by increasing atomic number, electron configuration, and recurring chemical properties.

Front

What are alkali metals?

Back

Alkali metals are the elements in Group 1 of the periodic table, known for being highly reactive and having one electron in their outermost shell. Examples include lithium (Li) and sodium (Na).

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Examples include air and salad.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together. For example, a water molecule (H2O) consists of two hydrogen atoms and one oxygen atom.

Front

What are halogens?

Back

Halogens are the elements in Group 17 of the periodic table, known for their reactivity and tendency to form salts with metals. Examples include fluorine (F) and chlorine (Cl).