Atoms
the positively charged central core of an atom
Nucleus
a system for arranging the chemical elements
The Periodic Table
the elements found on the far right side of the periodic table
Helium, Neon, Argon, Krypton, Xenon, and Radon (Noble Gases)
elements that lose electrons easily, are lustrous, malleable, and are good conductors of heat and electricity
Metals
What instrument would you use to separate sand and iron filings?
A magnet
a very small particle that exists in the nucleus of every atom and has a positive charge of electricity
Proton
What is any horizontal row of elements on the periodic table?
Period
Diamonds are a pure form of what element?
Carbon
These elements are not shiny, they are ductile, poor conductors of electricity, and brittle.
Non-Metals
True or False--Each part of a mixture keeps its properties when mixed.
True
a very small particle that has a negative charge of electricity and travels around the nucleus of an atom
Electron
The periodic table arranges the elements in rows and columns. The columns form groups of elements that have similar chemical properties. What is another name for these groups?
Groups are also known as Families
found on the far left side of the periodic table
Hydrogen, Lithium, Sodium, Potassium, Rubidium, Caesium, and Francium (Alkali Metals)
elements that generally do not conduct electricity
Non-metals
In which mixture can you see all of the parts?
Heterogeneous
a subatomic particle of about the same mass as a proton but without an electric charge
Neutron
The months of the year are ___ because they repeat in the same order every 12 months.
Periodic
On the far right side of the periodic table, in group 18, is a unique group of elements called
Noble gases
Hydrogen, Lithium, Sodium, Potassium, Rubidium, Caesium, and Francium are all...
Alkali metals
What are the two types of mixtures?
Homogeneous and Heterogeneous
What is the sum of an atom's protons and neutrons called?
Atomic Mass
Who is the inventor of the periodic table of the elements?
Dimitri Mendeleev
What is the same element with the same number of protons but different numbers of neutrons in each atom.
Isotopes
a unique group of elements that share properties of both metals and nonmetals
Metalloids
If a substance dissolves in water, it is said to be ____ in water.
Soluble