Elements on the periodic table are arranged in order of ________________.

• average atomic mass

• atomic number

• metallic characteristics

• number of neutrons

Elements in the same ___________ share similar chemical and physical properties because ______________.

• block, they have electrons in the same orbital sublevel

• period, they have the same number of energy levels

• group, they have the same number of valence electrons

• triad, they have the same number of valence electrons and energy levels

How do metallic properties change throughout the periodic table?

• Across a period stays the same. Down a group increases.

• Across a period decreases. Down a group stays the same.

• Across a period increases. Down a group decreases.

• Across a period decreases. Down a group increases

Conducts electricity and heat very well

Select all that apply.

• Metals

• Nonmetals

• Metalloids

Tags

NGSS.MS-PS2-3

Poor conductors

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• Metals

• Nonmetals

• Metalloids

Semiconductors

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• Metals

• Nonmetals

• Metalloids

Tags

NGSS.MS-PS3-3

Solids are shiny

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• Metals

• Nonmetals

• Metalloids

Solids are dull

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• Metals

• Nonmetals

• Metalloids

Solids are malleable

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• Metals

• Nonmetals

• Metalloids

Solids are brittle

Select all that apply.

• Metals

• Nonmetals

• Metalloids