Periodic Table

Front

What is a metalloid?

Back

A metalloid is an element that has properties of both metals and nonmetals. An example is silicon (Si).

Front

Which element is a metalloid?

Back

Silicon (Si) is a metalloid.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost energy level of an atom that are involved in chemical bonding.

Front

Why did watchmakers stop using radium?

Back

Watchmakers stopped using radium because it made the dial painters sick due to its radioactivity.

Front

What does atomic mass represent in a periodic table square?

Back

Atomic mass is the weighted average mass of an element's isotopes, usually expressed in atomic mass units (amu).

Front

What does the atomic symbol represent?

Back

The atomic symbol is a one or two-letter abbreviation that represents an element on the periodic table.

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

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.

Front

What are the main categories of elements in the periodic table?

Back

The main categories are metals, nonmetals, and metalloids.

Front

What is a chemical bond?

Back

A chemical bond is a lasting attraction between atoms that enables the formation of chemical compounds.