Atomic Structure

Where can you find most of an atom's mass?

• In the electron cloud
• in the orbitals around the nucleus
• in the nucleus
• in a doctor's office

Tags

NGSS.HS-PS1-8

The subatomic particles of an atom include all of the following EXCEPT

• protons
• elements
• neutrons
• electrons

Tags

NGSS.MS-PS1-1

What does the atomic number of an element represent?

• number of protons in an atom
• number of neutrons in an atom
• mass of an atom
• charge of an atom

The total number of protons and neutrons in an atom is called the...

• proton number
• atomic number
• mass number
• weight number

How many protons does an Aluminum atom have? (use the picture to help you)

• 27
• 13
• 14
• 40

Tags

NGSS.MS-PS1-1

What is the name of the subatomic particle that is neutral?

• Ion
• electron
• neutron
• proton

What determines the charge of an atom?

• the atomic mass of the atom
• the number of protons and electrons
• the number of neutrons and protons
• the number of energy levels in the electron cloud

The nucleus of an atom contains 12 protons and 13 neutrons. If the atom is electrically neutral, how many electrons does this atom have?

• 13
• 12
• 14
• 20

Tags

NGSS.MS-PS1-1

What characteristic of an element's atoms ALWAYS determines the element's identity?

• the number of neutrons
• the number of protons
• the atomic mass
• the number of valence electrons

How many neutrons does a sodium atom have? 

• 23
• 11
• 12
• 34

Tags

NGSS.MS-PS1-1