Matter

How are elements organized in the periodic table?

• by density and date of discovery

• by atomic number and properties

• by atomic mass and melting point

• by abundance in nature and usefulness to humans

Which of these is smallest?

• cells

• atoms

• matter

• elements

How do atoms of copper differ from atoms of aluminum?

• They are not pure substances.

• They have different chemical properties.

• They can be formed by physical changes.

• They are made up of more than one type of particle.

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Which substance is one that cannot be separated or broken down into simpler substances by chemical means?

• table salt

• gold wire

• candle wax

• water vapor

Think about a wooden chair and a balloon. What do these two objects always have in common?

• They are both made of atoms.

• Both have the same physical properties.

• Both are made of the same kind of atom.

• Both are made of the same number of atoms.

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Which two elements are most likely to have similar physical properties?

• copper and zinc

• copper and silver

• cadmium and indium

• gallium and cadmium

Which statement correctly describes atoms?

• Atoms combine to make all the substances on Earth.

• Atoms of all substances have the same chemical properties.

• Atoms are easily destroyed when matter is cooled or heated.

• Atoms come in different sizes, but most are visible using a simple hand lens.

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Which pair of elements is most likely to have similar properties?

• tungsten and osmium

• osmium and hassium

• seaborgium and rhenium

• bohrium and tungsten

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Which properties do atoms of the same element share? Select all that apply.

• atomic number

• chemical reactivity

• melting point

The three elements in the photos all belong to the same group, or column, of the periodic table. These elements all produce salts when they react with metals. What are some differences between these elements? Select all that apply.

• their colors

• their atomic numbers

• the state of matter of each element

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