Unit 2

The vertical (up and down) columns in the Periodic Table are called

• groups

• towers

• periods

• atomic numbers

The Modern Periodic Table of Elements is arranged by

• atomic mass
• atomic number
• valence electrons
• number of isotopes

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Which group of the periodic table is composed of inert (not reactive)  gases?

• alkali metals
• alkaline earth metals
• halogens
• noble gases

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Which is an alkali metal?

• Magnesium
• Iron
• Sodium
• Europium

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Which is a halogen?

• Helium
• Chlorine
• Oxygen
• Neptune

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Elements in a ..................have similar chemical properties.  

• period
• group
• row

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I am a metal

I am in group 2

I am in period 6

I am…

• Mo

• Re

• S

• Ba

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I am a nonmetal

I am in period 2

I am in group 16/6A

• Ba

• Si

• Ba

• O

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Which element does this Bohr model represent?

• Aluminum

• Silicon

• Magnesium

• Cobalt

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What is the mass of this atom?

• 9

• 10

• 19

• 28

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