2023 2nd Semester Recap L1 May 12 8th Period

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

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

• nucleus 
• electron cloud
• core 
• center 

Particles in an atom that are neutral and have no charge are 

• negatrons 
• electrons 
• neutrons 
• protons 

What number indicates the nucleus?

• 1
• 2
• 3
• 4

What number indicates an electron?

• 1
• 2
• 3
• 4

What is the mass number?

• the number of protons
• the sum of the number of protons and the number of neutrons in the nucleus of an atom 
• the number of electrons
• the number of neutrons

All matter is made of 

• energy 
• atoms 
• air
• chemistry

What is the Element's atomic number?

• Fe
• 26
• 55.847
• Iron

An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?

• 15
• 31
• 16
• 47

An atom has 5 protons and 7 neutrons. What is the mass number of the atom?

• 5
• 7
• 2
• 12