The Atom and the Periodic Table of Elements

This is the smallest particle into which an element can be divided:

• compounds
• atoms 
• electrons 

The particle in an atom with a positive charge that is found in the nucleus is a:

• Electron

• Proton

• Neutron

The particles in an atom with a negative charge that are outside the nucleus are called:

• Electrons

• Protons

• Neutrons

The SI unit used to express the masses of particles in an atom is called the:

• kilogram
• gram
• atomic mass unit (amu)

If an atom has an atomic mass of 184 and atomic number of 74, what is the number of neutrons? (Hint: Subtract!)

• 110

• 74

• 184

The vertical columns (up and  down) in the Periodic Table of Elements are called:

• Rows
• Columns
• Groups

The horizontal rows (left to right) in the the Periodic Table of Elements are called:

• Periods
• Groups
• Charts

Energy levels that circle the nucleus hold the:

• protons

• electrons

• neutrons

The center of an atom which contains PROTONS AND NEUTRONS is called the:

• Shell
• Nucleus
• brain

An area around the nucleus where electrons can be found

• Electron Cloud
• Outer Atom
• Negative Cloud