Unit 2 Pretest: Atoms and The Periodic Table

Front

What are elements?

Back

Elements are pure substances that cannot be broken down into simpler substances by chemical means. They are the basic building blocks of matter.

Front

Which two elements are commonly known gases at room temperature?

Back

Oxygen (O) and Helium (He) are both gases at room temperature.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of elements, organized by increasing atomic number, that displays their properties and relationships.

Front

What is the charge of an electron?

Back

The charge of an electron is negative.

Front

What are metalloids?

Back

Metalloids are elements that have properties of both metals and nonmetals and are found along the stair-step line on the periodic table.

Front

What is the atomic structure of an atom?

Back

An atom consists of a nucleus containing protons and neutrons, surrounded by electrons in orbitals.

Front

What is the role of protons in an atom?

Back

Protons are positively charged particles found in the nucleus of an atom and determine the element's identity.

Front

What is the role of neutrons in an atom?

Back

Neutrons are neutral particles found in the nucleus of an atom that contribute to the atomic mass.

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the composition of a substance using symbols for its constituent elements.

Front

What is the difference between a compound and an element?

Back

A compound is a substance formed when two or more elements chemically bond together, while an element is a pure substance that cannot be broken down.