Atoms
The smallest unit of ordinary matter that forms a chemical element.
A atom
Is a tabular display of the chemical elements
A periodic table
an atom that has gained or lost ELECTRONS
A ion
The numbers 12, 13, 14 refer to the
mass#
Who came up with the periodic table
Dmitri Mendeleev and Albert Ghiorso came up with it together
Why do all the atoms of a element have the same atomic number?
atoms of an element has, essentially, the same number of protons.
How do you Identify physical and chemical properties of elements
Look for chemical change
What is the charge of a ion considered to be?
Negative
This form of notation is known as
Isotope notation
How do you identify an element and its mass
mass number = protons + neutrons
What is the same among all elements in a group
the same number of valence electrons
How do ions work
It is charged because the number of electrons do not equal the number of protons in the atom or molecule
The other form of isotope notation is known as
Nuclear notation
The scientist responsible for learning about the structure of an atom
John Dalton
What is the same among all elements in a period
All elements in a row have the same number of electron shells
How do ions form
Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions
Different versions of the same element like 12C, 13C, 14C are known as
Isotopes
What did John Dalton discover?
Dalton's atomic theory suggested that all matter was comprised of indivisible and indestructible atoms with distinct masses and properties
How are elements organized on the periodic table.
It arranges the elements in increasing order of their atomic numbers and groups atoms with similar properties in the same vertical column
How atoms gain or lose electrons to become ions?
If atoms lose electrons, they become positive ions or cations. If atoms gain electrons, they become negative ions or anions
What subatomic particle makes each of these isotopes different?
Atomic mass