Basics of Atomic Theory
What is an Isotope?
An atom with the same number of protons but different number of neutrons.
Who discovered the Atom?
John Dalton
Who is the “Father of the Periodic Table?”
Mendeleev
1st group
Alkali Metals
Metal Characterisitcs?
Duck-table, Shiny, malleable
What is the definition of average atomic mass?
The average of masses of all isotopes of an element.
Who discovered the Electron?
J.J Thomson
Who organized the elements in increasing periodic number?
Moosely
2nd Group
Alkali Earth Metals
Non-metal Characteristics?
Insulates, brittle, do not conduct heat/electricity
What is the Law of Conservation of Mass?
Mass can neither be created nor destroyed during a chemical reaction.
What are the 3 Models of the Atom?
Empty sphere, the plum putting model, & positive charged atoms in the middle.
What states that when the elements are arranged by increasing atomic number, there is a periodic repetition of their properties
Periodic Law.
D Block
Transition Metals
Metaloides Characterisitcs?
Shiny, Does not bend, conducts electricity
What is the Law of Definite Proportions?
Chemical compounds have exact composition.
1) All matter is made of atoms. Atoms are indivisible and indestructible. 3) Compounds are formed by a combination of two or more different kinds of atoms. 4) A chemical reaction is a rearrangement of atoms.
What are Mendaleav’s Contributions to the periodic table?
1. All elements of the same property are in the same group
2. Decided to place elements on the periodic table based on increasing atomic mass
F Block
Inner Transition Metals
What are Valence Electrons?
Electrons on the outermost level
What is the Law of multiple proportions?
If two or more different compounds are composed of the same 2 elements, the 2 different masses combine in a ratio of small whole numbers.
What is Modern Atomic Theory?
1. All matter is comprised of tiny, definite particles called atoms.
2. Atoms are indivisible and indestructible.
3. All atoms of a particular element share identical properties, including weight.
4. Atoms of different elements contain different mass. And
5. Atoms of different elements combine in fixed whole-number ratios when forming compounds.
What is Mosly’s contribution to the periodic table?
He ordered the elements in atomic number.
8th Group
Noble Gases
Noble Gases