Bohr Model & Parts of the Atom

What number indicates the nucleus?

• 1
• 2
• 3
• 4

Where is most of the mass in an atom located?

• in the nucleus
• in the protons
• in the neutrons
• in the electrons

Each element is unique and different from other elements because of its 

• atomic number
• number electrons
• mass number
• average atomic mass

Oxygen’s atomic number is 8. This means that an oxygen atom must have

• 8 electrons and 8 protons

• 8 protons and 8 neutrons

• 8 neutrons

• a mass number of 8

What number indicates a proton?

• 1
• 2
• 3
• 4

The particles with no charge in an atom are the _______.

• electrons
• neutrons
• protons
• protons and neutrons

What number indicates an electron?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS2-3

How many neutrons are in this element?

• 5

• 27

• 32

• 59

What is between the nucleus and the electrons in an atom?

• Water vapor
• nothing
• more atoms

12. How many protons are in the neutral atom shown below?

• 8
• 22
• 12
• cannot be determined from the information given