Exam 3: Atomic Structure

Electrons occupy most of the volume of an atom.

A 5s orbital will have higher energy than a 5d orbital.

In which group do all atoms have seven valence electrons in the ground state?

How many protons are in this isotope of uranium?

The isotope of carbon commonly referred to as "carbon-14" is

The specific pattern of colors emitted by excited atoms is called a

The identity of an element is determined by the ________ in the atom.

When an electron in an excited atom "falls down" to a lower energy level,the excited atom emits a characteristic

Which element has the same number of valence electrons as phosphorus?

In the United States,the letter A identifies the main group elements and the letter B indicates the transition metal elements of the periodic table.

Two elements can have the same line spectrum.

How many neutrons are there in the sulfur-31 isotope?

The isotope of hydrogen that contains two nucleons is

The mass of the electrons in atoms is generally regarded as

Essentially all of the mass of an atom is due to the

Which experimental observation led scientists to speculate that cathode rays contained particles that were constituents of all matter?

The number of electrons in a neutral atom is equal to the

Most of the mass of an atom is located in the electrons of the atom.

In which group do all atoms have one valence electron in the ground state?

The element iron (Fe)occurs naturally as four isotopes.Each of these isotopes has