Atoms and the Periodic Table

Dot diagrams are used to represent _____.

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

What does this picture represent? 

A chemical symbol represents the _____ of an element. 

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

On the periodic table what does the column/group number tell us? 

Electrons have a ______ charge. 

Neutrons have a _____ charge. 

Protons have a _____ charge. 

Elements in group 3 through 12 are called _____. 

Horizontal rows of the periodic table are called _____. 

An atom has 26 protons, 26 electrons and 30 neutrons, what is its mass number? 

The nucleus of an atom is _____ charged. 

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

A _____ is matter that is composed of one type of atom. 

What does this picture represent? 

He proposed, electrons revolve in orbits around the nucleus, at certain energy levels. 

The smallest piece of an element that still retains the properties of the element is a(n) _____

The creator of the first periodic table. 

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