Unit 4 - Midterm Exam Review - 24-25

Front

What are isotopes?

Back

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

Front

What is a group in the periodic table?

Back

A group is a vertical column in the periodic table that contains elements with similar chemical properties.

Front

What is a period in the periodic table?

Back

A period is a horizontal row in the periodic table that indicates the number of electron shells in the elements.

Front

What does the smaller number on the periodic table represent?

Back

The smaller number on the periodic table represents the atomic number, which is the number of protons in an atom.

Front

What is the atomic number of Calcium?

Back

The atomic number of Calcium is 20.

Front

What are elements?

Back

Elements are pure substances that cannot be broken down into simpler substances and are made up of only one type of atom.

Front

What are compounds?

Back

Compounds are substances formed when two or more elements chemically bond together in fixed proportions.

Front

What are mixtures?

Back

Mixtures are combinations of two or more substances that are not chemically bonded and can be separated by physical means.

Front

What is the mass number of an atom?

Back

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

Front

How do you determine the number of neutrons in an isotope?

Back

To determine the number of neutrons, subtract the atomic number (number of protons) from the mass number.