Atomic Structure Exit Ticket

What is the mass number of a potassium (K) atom that has 20 neutrons?

• 18
• 19
• 20
• 39

A model of a beryllium atom is shown here.
 What types of particles are found in the cloud surrounding the atom’s nucleus?  

• Positively charged particles and negatively charged particles
• Negatively charged particles only
• Neutral particles and positively charged particles
• Positively charged particles only

What is the total number of subatomic particles in an atom of Gallium (Ga)?

• 101
• 100
• 31
• 70

What are the two main parts of the atom?

• nucleus and cytoplasm
• nucleus and electron cloud
• core and electron cloud
• protons and neutrons

Most of the mass in an atom is made up of _____________________?

• protons and electrons
• protons and neutrons
• neutrons and electrons
• electrons and quarks

What subatomic particle is electrically neutral (no charge)?

• Proton
• Ion
• Neurton
• Electron

How many neutron are in the atom "K"?

• 7
• 2
• 39
• 20