Chapter 16 Quiz

The atomic number identifies the number of __________.

• electrons

• atoms

• protons

• neutrons

An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.

• 20
• 10
• 5
• 25

Which particle has a positive charge?

• electron
• quark

• proton
• neutron

Isotopes are atoms of the same element with  different numbers of _________________ .

• Protons
• Neutrons
• Electrons
• Quarks

What are valence electrons?

• electrons on the first orbital always
• nucleus
• the outermost shell
• the number of electrons in the outermost orbital

Which of these is the proton.

• A
• B
• C
• None

What is the number of protons that the element in this image contain?

• 14
• 7
• 15
• 18

How many electrons does Oxygen have?

• 16

• 8

• 15.99

• O

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