The periodic table
What does the periodic table of elements represent?
The periodic table shows the atomic mass and atomic number of each element.
Define an element
a substance that cannot be chemically interconverted or broken down into simpler substances
________ is the only part of the electromagnetic spectrum seen by the human eye
Visible light
What are isotopes
variants of atoms of a particular chemical element, which have differing numbers of neutrons
What are the 4 categories of the periodic table
There are four (4) different sections of the periodic table. Metal, Non-Metal, Metalloids, and Noble Gasses.
Define a nucleus
the very small dense region in the center of an atom that contains all the positive charge and most of the mass.
What type of radiation can damage your skin
Ultraviolet rays
What is nuclear fusion
The process by which two or more atomic nuclei join together, or "fuse", to form a single heavier nucleus
What is a valence electron
Electrons that are the farthest from the nucleus: help atoms bond with other atoms.
________ is a pure substance formed when 2 or more different elements combine
Compound
What is the electromagnetic wave with the longest wavelengths and lowest frequencies
Radio waves
The power generated by nuclear fusion processes
Fusion power
Who created the periodic table
Dmitri Mendelev
True or false, neutrons have a negative charge
False, they have no charge
Which electromagnetic wave has the shortest wavelengths and highest frequencies
Gamma rays
The time required for half the atoms of a particular radioisotope to decay into another isotope
Half life
How many elements are liquid at room temperature
Only two
Define an alpha particle
Helium ions that are positively charged.
Name all 6 parts of the electromagnetic spectrum
ultraviolet, infrared, X-rays, gamma rays, microwaves, and radio waves.
What is nuclear fission
a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.