Explore the World of Atoms
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Questions and Answers

What is the smallest unit of matter called?

atom

What are the three subatomic particles that make up an atom?

protons, neutrons, and electrons

What is the electrical property of a particle called?

charge

What is the mass of a proton?

<p>one atomic mass unit</p> Signup and view all the answers

What is the charge of an electron?

<p>negative</p> Signup and view all the answers

What is the mass of an electron?

<p>very, very small (9.10938356 x 10^-31 kilograms)</p> Signup and view all the answers

What is the percentage of an electron's mass compared to a proton's mass?

<p>about 0.05%</p> Signup and view all the answers

What is the basic unit of matter?

<p>atom</p> Signup and view all the answers

What are the two basic traits used to categorize subatomic particles?

<p>charge and mass</p> Signup and view all the answers

What is matter?

<p>a physical substance that takes up space and has mass</p> Signup and view all the answers

What is the mass and charge of a proton?

<p>A proton has a mass of one atomic mass unit and a positive charge.</p> Signup and view all the answers

What is the mass and charge of a neutron?

<p>A neutron has a mass of one atomic mass unit and a neutral charge.</p> Signup and view all the answers

What is the mass and charge of an electron?

<p>An electron has a negligible mass and a negative charge.</p> Signup and view all the answers

What is the atomic number?

<p>The atomic number is the number of protons in an atom's nucleus.</p> Signup and view all the answers

How does the atomic number determine an atom's identity?

<p>The atomic number determines the atom's identity. For example, an atom with six protons in its nucleus is a carbon atom.</p> Signup and view all the answers

What is an element?

<p>An element is a substance that is composed of a single type of atom.</p> Signup and view all the answers

How are elements organized in the periodic table?

<p>Elements are organized into columns and rows in the periodic table.</p> Signup and view all the answers

What information is listed for each element in the periodic table?

<p>Each element is listed with its full name, symbol, atomic number, and atomic mass.</p> Signup and view all the answers

What is matter?

<p>Matter is any physical substance that takes up space and has mass.</p> Signup and view all the answers

What is an atom?

<p>An atom is the basic unit of matter, made up of three smaller subatomic particles: protons, neutrons, and electrons.</p> Signup and view all the answers

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