Chapter 4 Atomic Structure

What is a chart that organizes all known elements into a grid of periods and groups?

• Periodic Table
• Pie Chart
• Line Graph

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The number of protons in an atom is referred to as what?

• atomic number
• mass number
• atomic mass

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What is the word that describes atoms with the same number of protons but a different number of neutrons?

• isotopes
• ions
• electrons

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What phrase describes the sum of the atomic number and neutrons in the nucleus?

• atomic mass
• symbol
• mass number

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What unit is defined as one-twelfth the mass of a carbon-12 atom?

• neutron
• electron
• atomic mass unit (amu)
• proton

The atomic mass of an element is the weighted average mass of blank of a element.

• animals
• neutrons
• ions
• isotopes

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What can atomic number also indicate?

• number of neutrons
• number of electrons
• number of animals in the forest
• aliens

What subatomic particle can be used to identify an element?

• neutron 
• electron
• proton 
• quark

Are all elements of an element identical?

• Yes 
• No

Chemical behavior is determined by the number of what in an atom?

• number of electrons
• number of protons

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