Unit 1 Test

The atom is mostly large empty space with a small, dense nucleus at the center

• Dalton

• Thomson

• Rutherford

• Bohr

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

Subatomic particles with a positive charge

• neutrons
• atomic mass
• protons
• isotopes

Subatomic particles that are neutral in charge

• Neutrons
• Protons
• Nucleus 
• Electrons

Where are electrons located in an atom?

• Nucleus
• Electron Cloud
• Within a Proton
• Within a Neutron

Atoms of the same element but with different numbers of neutrons.

• Ion
• Isotope
• Mass Number
• electron

Carbon has how many protons?

• 12

• 6

• 7

• 4

What is Oxygen's atomic number?

• 8

• 16

• 15

• 6

Iodine has ______ electrons

• 127

• 53

• 74

• 7

How many electrons are in Manganese (Mn) ?

• 12
• 25
• 55
• 30