Atom Unit Review

An element's atomic number is always equal to how many ______________ it has.

• protons 
• neutrons
• electrons
• nuclei

An element has an atomic mass # of 30 and contains 12 protons.  If it is a neutral element how many electrons will it contain?

• 30
• 12
• 18
• 10

What is the atomic mass of an element with 40 protons, 40 electrons, and 46 neutrons?

• 80
• 6
• 86
• Not enough information

Which of the following includes all of the subatomic particles found in the nucleus of an atom?

• Electrons and protons
• Electrons, protons, and neutrons
• Neutrons and electrons
• Protons and neutrons

The number at the bottom of each square on the periodic table is the ...

• atomic number
• atomic mass
• chemical symbol
• element name

Tags

NGSS.MS-PS1-1

The number at the top of each square on the periodic table is the ...

• atomic number
• atomic mass
• Chemical Symbol
• Element Name

Tags

NGSS.MS-PS1-1

Pure forms of these elements are stored in oil so they won't react with oxygen and water in the air.

• Alkali Metals
• Alkaline-earth metals
• Halogens
• Noble Gases

Tags

NGSS.MS-PS1-2

Most of the elements on the periodic table are classified as _____.

• Metals
• Nonmetals
• Metalloids
• Periods

Which of these is not a noble gas?

• Helium
• Argon
• Nitrogen
• Krypton

Tags

NGSS.HS-PS1-1

True or false: Noble gases react with water

• True
• False