Atoms and the Periodic Table

The center of an atom is called a 

Scientist ___ developed a simplified model of an atom.

Abbreviation for the name of an element

How many VALENCE electrons does the modeled atom have?

A column on the periodic table of the elements is called a

The smallest piece of an element that can be recognized as that element

Of the four atoms pictured, which two would be in the same Group?

A row on the periodic table of the elements is called a 

A classification system for the elements

If the element copper has 29 protons, how many electrons does it have?  

Special machine that smashes atoms

The scientist ___ developed the periodic table of the elements that is most widely used today.

How many total electrons does the modeled atom have?

Based on the number of protons in the nucleus

The study of matter

The sum of the number of protons and neutrons results in an atom’s approximate ___ .

The nucleus contains neutrons and

A substance; only one kind of atom

An atom has 18 protons and 8 valence electrons. Which statement would best identify this element?

Spinning around the nucleus are energetic particles called 

Which two elements are in the same period?

Sodium (Na) is a highly reactive element. Which characteristic of sodium is responsible for its reactivity?