Elements
what is everything around us made of?
Elements
How many groups are in the periodic table?
3 Groups metals, nonmetals and semimetals
How many Electrons can hold the third shell?
18 electrons
What is a Compound?
It is a material formed by chemically bonding two or more chemical elements.
What is an Isotope?
It is a different form of an element that has the same atomic number but a different mass number.
What is the atomic mass composed of?
protons and neutrons.
What is the periodic table of elements sorted by?
Their physical and chemical properties
What is an Electron?
They are the negatively charged particles of atom.
What are the two types of Compound bonds?
Ionic bonds and Covalent bonds.
Are all Isotopes considered stable?
Some isotopes are stables and some are unstables.
What are the three atoms that makes up an element?
Protons, Electrons, and Neutrons
What does the atomic number mean?
The number of protons in that element
What is the valence shell?
The Outermost Shell
How do we get Positive and Negitive ions?
We add or subtract electrons
What does Stable mean when talking about atoms?
Stable means it can exist naturally; it is just heavier or lighter.
What is an Element?
The Pure substances that cannot be divided into any simpler substances
What are the groups in the periodic table?
The families of elements wath silmlar chemical properties that lie in that same vertical columm
What do all atoms want?
To have a full valence shell
Do exothermic reactions release energy or take in energy?
It releases energy in the form of heat
When could a icotope be cosidered an radioactive isotope?
When the unestable isotopes decay over time and eventually them turns into another isotope or element.
Who was the first person to discover the elements?
Hennig Brandt
What is the periodic table?
It is a chart of all known elements arranged in to columns and rows according to their physical and chemical properties.
What is the most important discovery that Rutherford made?
Rutherford's experiment only accounted for ¨alpha particles¨ (Protons)
What is a catalyst?
A catalyst simply speeds up the rate of a reaction.
What is an atomic number?
The number of protons.