The Arrangement of Elements in the Periodic Table Flashcards
first attempted to group the elements by threes based on the observed similar properties among them. This early attempt was then called the law of triads.
- Johann Dobereiner
He then created a three-dimensional arrangement and representation of the elements called the Telluric Screw.
- Alexandre Beguyer de Chancourtois
proposed that elements can be arranged using atomic weights with similar properties, which may be observed at a regular interval every seventh element. This is known as the law of octaves.
- John Newlands
arranged the 60 known elements at that time using their increasing atomic mass.
- Dmitri Mendeleev
published his arrangement of elements based on the increasing atomic mass similar to that of Mendeleev. Unfortunately, both arrangements were not fully accepted.
- Lothar Meyer
determined the atomic number of each known element at that time, he realized that elements may be arranged in order of increasing atomic number. He then revised the periodic law, which states that similar properties would repeat periodically when elements are arranged in increasing atomic numbers.
- Henry Moseley
was able to successfully synthesize transuranic elements. These are the elements after the element uranium in the periodic table.
- Glenn Seaborg
There are three types of elements:
- Metal
- Nonmetal
- Metalloid
- Valence electrons
The outermost electrons of atoms.
The vertical arrangement in the periodic table.
- Period
the elements are numbered from 1 to 18, from left to right, of the periodic table according to the current IUPAC arrangement.
- Group
IUPAC
International Union of Pure and Applied Chemistry
shows a pattern of the properties of elements based on their location and group.
- Periodic trends
one-half the distance between the nuclei of two atoms.
- Atomic radius
the amount of energy required to remove an electron from a neutral atom in its gaseous phase.
- Ionization energy
