Atomic Structure Basics Quiz

The relative mass of a neutron is 1 atomic mass unit (amu), which is about $1.67 imes 10^{-27}$ kg.

A cation is a positively-charged ion formed when an atom loses electron(s). In a cation, the number of protons is more than the number of electrons. An anion is a negatively-charged ion formed when an atom gains electron(s). In an anion, the number of electrons is more than the number of protons.

The nucleon number (A) is the number of protons plus neutrons in the nucleus of an atom, or the mass number. The atomic number (Z) is the number of protons in the nucleus. In a neutral atom, the number of electrons is equal to the number of protons.

<p>An atom consists of a very small, dense nucleus containing protons and neutrons, surrounded by mostly empty space. Electrons are found outside the nucleus in regions called electron shells, orbiting the nucleus at various distances and energy levels.</p> Signup and view all the answers

<p>The relative mass of an electron is approximately 1/1836 times the mass of a proton or neutron. It is considered negligible because it is much smaller compared to the masses of protons and neutrons.</p> Signup and view all the answers