The Periodic Table

What happens to the mass of atoms as you move from left to right and downwards in the Periodic Table?

• The mass increases

• The mass decreases

• The mass remains the same

• The mass fluctuates

Explain the relationship between atomic number and the number of protons in an element.

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An atom has no overall charge because the number of protons is the same as the number of ___.

Which subatomic particle has a positive charge?

• Proton

• Electron

• Neutron

• Photon

Describe how the atomic number changes as you move across the Periodic Table.

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The atomic number of an element tells you how many ___ it contains.

Analyze why an atom of hydrogen has less mass than an atom of sodium.

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What does the atomic mass of an element indicate?

• The volume of the atom

• The mass of the atom

• The number of protons in the atom

•  The density of the atom

Which element has an atomic mass of 12?

• Hydrogen

• Carbon

•  Sodium

• Iron

What is the density of iron according to the excerpt?

• 0.97 g/cm³

• 1 g/cm³

• 7.87 g/cm³

• 10 g/cm³