Explore the World of Atoms

atom

protons, neutrons, and electrons

charge

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

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

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

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

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

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

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

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

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

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

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

<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

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

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

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

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

<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