Atomic Theory 1

An atom's mass number is found by adding the number of _________ with the number of __________

• protons, neutrons

• protons, electrons

• electrons, neutrons

• atoms, electrons

This atom has a mass number of

• 5

• 4

• 9

• 14

This particle is found in the nucleus and has no charge

• Neutron
• Proton
• Electron
• Orbital

This particle is found in the nucleus and has a positive charge

• Electron
• Proton
• Neutron
• Neutral

This is a negatively charged particle found outside the nucleus

• Electron
• Proton
• Neutron
• Orbital

J.J. Thomson provided evidence that an atom...

• is the smallest particle of matter
• contains negatively and positively charged particles
• has an overall negative charge
• has an overall positive charge

Ernst Rutherford discovered which part of the atom through the use of gold foil?

• Proton
• Neutron
• Electron
• Orbitals

The central region of an atom where its neutrons and protons are is its 

• Nucleus 
• Electron Cloud
• Core 
• Center 

mass number is 38 and atomic number is 18.How many protons are there?

• 20

• 21

• 19

• 18

How many electrons does the following element have?

• 11
• 12
• 23