Atoms

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

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

The nucleus of an atom contains 12 protons and 13 neutrons. What is the relative atomic mass of the atom?

• 12

• 13

• 24

• 25

Tags

NGSS.MS-PS1-1

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

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