Chapters 4, 5, & 6 Test Review

Front

What determines the atomic mass of an atom?

Back

The atomic mass is a weighted average of the masses of an element's isotopes.

Front

Which of the following is special for any given element?

Back

The number of protons.

Front

As you move from left to right across the periodic table, what happens to the number of valence electrons?

Back

The number of valence electrons increases.

Front

What was the significance of Mendeleev's periodic table?

Back

The discovery of new elements with predicted properties.

Front

What does Group 7A of the periodic table contain?

Back

The most reactive nonmetals.

Front

Define atomic number.

Back

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

Front

What is an isotope?

Back

Atoms of the same element that have different numbers of neutrons.

Front

What is the periodic law?

Back

The properties of elements are a periodic function of their atomic numbers.

Front

What are valence electrons?

Back

Electrons in the outermost shell of an atom that are involved in chemical bonding.

Front

What is the significance of the periodic table?

Back

It organizes elements based on their properties and atomic structure.