Chemistry Atom Study Guide Questions and Answers

Chemistry Atom Study Guide

Atom - answer The smallest particle of an element that retains the properties of the
element

Atomic weight (mass) - answerThe mass of the element as listed on the periodic table

Ion - answer This is formed when an atom has lost or gained electrons, making the
atom no longer electrically neutral, therfore it is no longer an atom, it is an ______

Atomic nucleus - answerCenter of the atom. It is made up of protons and neutrons.

Atomic number - answerThe number of protons in the nucleus of an atom of that
element
-it is the number of protons that determines the identity of an element

Cathode ray tube - answerThe movement in gas discharge tubes discovered by
Thomson

Electron - answerA subatomic particle with a negative charge. The smallest of the three
particles that make up atoms

What are the three particles that make up atoms? - answerProtons, neutrons, electrons

Isotope - answerDifferent forms of atoms having the same number of protons but if
fervent number of neutrons. It's the same element but different neutrons.

Mass number - answerVery close to the actual mass of the atom
-it is the total of the protons and neutrons in the nucleus

Neutron - answerA subatomic particle of about the same mass as a proton but without
an electric charge

Proton - answerA subatomic particle with a positive electric charge equal in magnitude
to that of an electron

What is the atomic number of an atom? - answerProton number

What is the mass number of an atom - answerThe number of protons plus the number
of neutrons

Formula for mass number - answer#nuetrons + #protons = mass number