The Atom
An atomic particle that has one positive charge.
What is a proton?
Page 320
The average mass of an elements isotopes, weighted according to the abundance of each isotope.
What is the average atomic mass?
Page 329
Made of two protons and two neutrons.
What is an alpha particle?
Page 331
An area around an atomic nucleus where an electron is most likely to be located.
What is an electron cloud?
Page 322
Atoms of the same element that have different numbers of neutrons.
What are isotopes?
Page 328
Elements that spontaneously emit radiation.
What is radioactive?
Page 330
The smallest piece of an element that still represents that element.
What is an atom?
Page 315
A particle with one negative charge.
What is an electron?
Page 317
Does not change one element into another element.
What is gamma decay?
Page 331
The sum of the number of protons and neutrons in an atom.
What is the mass number?
Page 328
A small area in the center of the atom where most of an atoms mass and positive charge is concentrated.
What is a nucleus?
Page 320
Too much _________ can damage or destroy living cells, making them unable to function properly.
What is radiation?
Page 331
A neutral particle that exists in the nucleus of an atom.
What is a neutron?
Page 321
A process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation.
What is nuclear decay?
Page 331