Chemistry 1st Semester Review

Front

What does the atomic number represent in an element's symbol, such as in 16_7N?

Back

The atomic number represents the number of protons in the nucleus of an atom.

Front

What is the central region of an atom where neutrons and protons are located?

Back

The central region is called the nucleus.

Front

Which type of elements are typically colored red on the periodic table?

Back

Nonmetals are typically colored red.

Front

How can two different elements have the same atomic mass?

Back

They can have different numbers of protons and neutrons.

Front

What is an isotope?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in the nucleus.

Front

What is the difference between atomic mass and mass number?

Back

Atomic mass is the weighted average mass of an element's isotopes, while mass number is the total count of protons and neutrons.

Front

What are metalloids?

Back

Metalloids are elements that have properties of both metals and nonmetals.

Front

What is the electron cloud?

Back

The electron cloud is the region around the nucleus where electrons are likely to be found.

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number and properties, helping to predict their behavior.