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Periodic Table of Elements
Periodic Table & Elements
Terms in this set (31)
What is an Element?
Pure substance that cannot be broken down into simplier substances; made up of only one type of atom; buildin blocks of all matter
What do all elements have in common?
They are all made up of the same fundamental particles: protons, neutrons and electrons
How do elements differ from each other?
# of protons in nucleus of the atoms, different arrangement and number of protons, neutrons and electrons
What is the rule for writing the chemical symbol for elements having two letter abbreviations?
Upper case first letter, lower case second letter
Who is credited with the developing the first Periodic Table?
Dmitri Medeleev (#101)
How were the elements organized in the first periodic table?
Atomic Mass and properties of the elements
How does the current organization of the elements differ from the originial method?
They didn't have the protons, neutrons and electrons
What is the significance of the color of the chemical symbol on the Periodic Table?
Black = Solid at room temp.
Red = Gas
Blue = Liquid
White = Man Made
What does it mean if the symbol is written in outline form? (white)
The element is man made; it doesn't occur in nature
What is the significance of the highlighted staircase on the right side?
It separates the metals from the nonmetals
What are Metaloids?
They border the staircase, they have both the properties of metals and nonmetals
What do we call orizontal rows on the periodic table?
Periods or series (1-7)
What do we call the vertical colomns on the periodic table?
Groups or families
What does the atomic number of an element represent?
The number of protons in the nucleus of the atom
What is the atomic mass of an element represent?
the number of protons plus the number of neutrons
What is an isotope?
Atoms of the same element that have a different mass due to a different number of neutrons
What is the basis of the atomic mass scale?
The standard for atomic mass scale is based on the isotope Carbon-12. Carbon 12 is assigned a mass of exactly 12 atomic units.
What is meant by the average atomic mass of an element?
The average number of all the isotopes.
How does the mass number of an atom differ from the average atomic mass of an element?
It is the average of all the isotopes that causes it to be a decimal. The mass number is the atomic number minus the number of neutrons
What are allotropes?
Allotropes are different forms of the same element due to a different arrangement of atom.
4 Allotropes of Carbon
Diamonds, Graphite, Charcoal, Carbon Nanotubes
What is nucleosynthesis?
The creation of an element
Why is it called the Periodic Table of the Elements?
When graphing their properties, it periodically peaks.
# of Protons
Have no charge; located in nucleus
Positive Charge; Located in Nucleus
mass number = _______
protons + neutrons
When is an atom neutral?
When an atom has the same number of protons and electrons
Atoms that have gained or lost electrons
When an atom gains electrons, it develops a ______ charge, called ______.
When an atom loses electrons it develops a ______ charge, called ______.
Recommended textbook explanations
Chemistry: Matter & Change, Florida
Sarquis, J., Sarquis, M.
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Science Fusion Ohio Student Edition Worktext Grade 8
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