Atoms and the Periodic table

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Each element is made up of atoms that have the same number of protons.

Front

What is the periodic table?

Back

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

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

What are the properties of metals?

Back

Metals are typically shiny, good conductors of heat and electricity, malleable, ductile, and have high melting points.

Front

What are nonmetals?

Back

Nonmetals are elements that are generally poor conductors of heat and electricity, and they can be gases, liquids, or brittle solids at room temperature.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together in fixed proportions.

Front

What is the difference between an element and a compound?

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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 chemically bonded together.

Front

What is conductivity?

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Conductivity is the ability of a material to conduct electricity or heat. Metals typically have high conductivity.

Front

What is the significance of the group number in the periodic table?

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The group number indicates the number of valence electrons in the elements of that group, which determines their 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 valence electron.