Chapter 4 Atomic Structure

All elements are composed of 

• molecules
• atoms
• neutrons
• compounds

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____________ can move from one energy level to another when they gain or lose energy.

• electrons
• protons
• neutrons
• atoms

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Atoms of the same element must always have the same number of _________

• electrons
• neutrons
• isotopes
• protons

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The dense, positively charged mass located in the center of the atom.

• nucleus
• proton
• isotope
• molecule

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The _________ of an element equals the number of protons in an atom of that element

• mass number
• atomic weight
• atomic number
• isotopes

The __________ of an atom is the sum of the protons and neutrons in the nucleus of that atom.

• mass number
• atomic number 
• atomic weuight
• isotope weight

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NGSS.HS-PS1-8

Two atoms of the same element but with different mass numbers are called________

• electrons
• isotopes
• variables
• electron cloud

Isotopes are elements with a different amount of

• protons
• neutrons
• electrons
• atoms

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NGSS.HS-PS1-8

The possible energies that electrons in an atom can have are called __________

• isotopes
• potential energies
• energy levels
• kinetic energies

Number of protons in an atom of an element.

• proton count
• atomic number
• atomic mass
• isotopes

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NGSS.HS-PS1-8