Exam 2: The Structure of Matter

Aluminum has an atomic number of 13. How many protons does it have?

The periodic table of the elements was developed by __________ in the late 19th century.

The first person to describe an element as being composed of identical atoms was __________.

The only difference between x-rays and gamma rays is their _________.

Two identical atoms which exist at different energy states are called ____________.

An atom that loses or gains one or more electrons is a(n) ________.

The term "atom" was first used by the ___________.

An atom in a normal state has an electrical charge of _______.

When an atom has the same number of protons as another, but a different number of neutrons, it is called an __________.

The binding energies, or energy levels, of electrons are represented by their ___________.

The atomic number of an element is symbolized by the letter _____.

The __________ is the least penetrating form of ionizing radiation.

A positively charged nucleus surrounded by negatively charged electrons in well-defined orbits is the ___________ model of the atom.

A chemical compound is any quantity of _______________.

The shell number of an atom is called the ___________________.

Rutherford's experiments in 1911 showed that the atom was composed of _________________.

The chemical element is determined by the number of __________ in the atom.

The innermost electron shell is symbolized by the letter _____.

The atomic number of molybdenum is 42 and the atomic mass number is 98. How many neutrons does it have?

What are the fundamental particles of an atom?