# What is Matter? Matter is anything that has mass. All objects are made of matter. Air, water, a brick, even you are made of matter!

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1 What is Matter? Matter is anything that has mass. All objects are mae of matter. Air, water, a brick, even you are mae of matter! Matter is mae up of smaller pieces. Over eighty years ago, scientists thought that the atom was the smallest piece of matter. At that time, the atom was thought to be the builing block of matter. In 1911, a scientist name Ernest Rutherfor iscovere that atoms are really mae of a positively charge center calle the orbite by negatively charge particles calle s. as it was known in In 1932, scientists iscovere that the of an atom is mae of smaller particles calle s an s. Protons carry a positive charge while s have no charge at all. Protons an s are each calle nucleons since they are foun in the. When they were iscovere, scientists thought they were the smallest piece of matter. as it was known in Thomas Jefferson National Accelerator Facility Office of Science Eucation

2 Scientists know that opposite charges attract an like charges repel, so they wonere why the s in the in t fly apart. They foun the answer in 1947 when they iscovere other particles that they name mesons. Mesons hol the s an s together to form the. as it was known in As scientists i more experiments, they began to realize that there was something funny about s an s. In 1968 they iscovere that s an s are mae up of smaller particles they calle quarks. Scientists iscovere six ifferent types of quarks: Up, Down, Strange, Charm, Top an Bottom. Protons have two Up quarks an one Down quark while s have two Down quarks an one Up quark. Quarks are hel to each other by particles scientists calle gluons. as it was known in u Some scientists now think that the quark is the smallest piece of matter. Scientists use to think that atoms were the smallest bit of matter, but they iscovere that it wasn t. Do you think that the quark is the smallest piece of matter or o you think that there might be something smaller insie the quark? Thomas Jefferson National Accelerator Facility Office of Science Eucation

3 What is Matter? Matter is anything that has mass. All objects are mae of matter. Air, water, a brick, even you are mae of matter! Matter is mae up of smaller pieces. Over eighty years ago, scientists thought that the atom was the smallest piece of matter. At that time, the atom was thought to be the builing block of matter. In 1911, a scientist name Ernest Rutherfor iscovere that atoms are really mae of a positively charge center calle the orbite by negatively charge particles calle s. as it was known in In 1932, scientists iscovere that the of an atom is mae of smaller particles calle s an s. Protons carry a positive charge while s have no charge at all. Protons an s are each calle nucleons since they are foun in the. When they were iscovere, scientists thought they were the smallest piece of matter. as it was known in Thomas Jefferson National Accelerator Facility Office of Science Eucation

4 Scientists know that opposite charges attract an like charges repel, so they wonere why the s in the in t fly apart. They foun the answer in 1947 when they iscovere other particles that they name mesons. Mesons hol the s an s together to form the. as it was known in meson As scientists i more experiments, they began to realize that there was something funny about s an s. In 1968 they iscovere that s an s are mae up of smaller particles they calle quarks. Scientists iscovere six ifferent types of quarks: Up, Down, Strange, Charm, Top an Bottom. Protons have two Up quarks an one Down quark while s have two Down quarks an one Up quark. Quarks are hel to each other by particles scientists calle gluons. as it was known in meson u gluon quark Some scientists now think that the quark is the smallest piece of matter. Scientists use to think that atoms were the smallest bit of matter, but they iscovere that it wasn t. Do you think that the quark is the smallest piece of matter or o you think that there might be something smaller insie the quark? Thomas Jefferson National Accelerator Facility Office of Science Eucation

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