Atoms and the Periodic Table Unit Test

The number of electrons in an element's outer energy level determines the _______ of the element.

A chemical symbol represents the ______ of an element.

Atoms of the same element with different numbers of neutrons are called _____.

The mass of an electron is about equal to the mass of a proton.

Each row in the periodic table ends with a ____.

What are elements on the far right of the periodic table classified as?

Where is most of the mass of an atom found?

The location of an electron in an atom cannot be pinpointed exactly.

The mass number of an atom is the sum of ______ and neutrons.

A difference between protons and electrons is that protons have a _______ charge and electrons have a _______ charge.

A particle that moves around the nucleus is a(n)_____.

If an element has 26 protons, 26 electrons, and 30 neutrons, what is its atomic mass?

Dot diagrams are used to represent ____.

Horizontal rows of the periodic table are called periods.

Every atom of the same element has the same atomic number.

Moving from left to right in a row of the periodic table, metallic properties increase.

Elements on the left side of the periodic table are classified as metals.

Particles of matter that make up protons and neutrons are ____.

Each energy level has a maximum number of _____ it can hold.

The sum of the number or protons and neutrons in an atom is the mass number.