Atomic Models & Atoms Flashcard

Front

The scientist who claimed that electrons move in circular paths around the nucleus was __________.

Back

Bohr

Front

Each chemical element is made up of only one kind of __________.

Back

atom

Front

This number identifies the element according to its number of protons in an atom's nucleus.

Back

Atomic Number

Front

What is the center of this atom made of protons and neutrons called?

Back

nucleus

Front

Chemists use one or two letters of the alphabet as __________ for the elements.

Back

chemical symbols

Front

What is the smallest unit of an element that retains the properties of that element?

Back

atom

Front

What is the positively charged center of an atom called?

Back

nucleus

Front

What are the negatively charged particles that orbit the nucleus called?

Back

electrons

Front

What is the term for atoms of the same element that have different numbers of neutrons?

Back

isotopes

Front

What is the term for the average mass of an element's isotopes?

Back

atomic mass