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Chemistry: Atomic Structure and Elements

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Chemistry: Atomic Structure and Elements

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Questions and Answers

What is the definition of a chemical element?

A collection of atoms that have the same number of electrons in their nucleus

A collection of atoms that have the same atomic mass

A collection of atoms that have the same number of protons in their nucleus (correct)

A collection of atoms that have the same number of neutrons in their nucleus

How are the elements arranged in the Periodic Table?

In periods (rows) and groups (columns) based on their atomic number (correct)

In alphabetical order by their chemical symbol

In random order with no specific pattern

In order of increasing atomic mass

What is the number of protons in an atom's nucleus known as?

Atomic Number (correct)

Electron Number

Proton Number

Atomic Mass

Where are the metals located in the Periodic Table?

Bottom left corner Signup and view all the answers

How many chemical elements are compiled in the Periodic Table of elements?

118 Signup and view all the answers

What did Dmitri Mendeleev use to observe periodic trends and similarities in grouping elements?

Physical properties Signup and view all the answers

What type of change involves the breaking and forming of bonds, resulting in a transfer of energy?

Chemical change Signup and view all the answers

What do elements in the same group of the Periodic Table possess?

Common physical and chemical properties Signup and view all the answers

What is the term for a substance that speeds up the rate of a chemical reaction?

Catalyst Signup and view all the answers

What is the term for a chemical reaction that releases energy?

Exothermic reaction Signup and view all the answers