Periodic Table Of Elements Flashcards
What is the number of protons in each nucleus of each atom?
Atomic number
A pattern of recurring properties is a what?
Periodicity
What are the vertical columns of the periodic table of elements?
Groups
What are the horizontal rows of the periodic table of elements?
Period
What is a set of elements with similar properties?
Family
Which is the most chemically active metals?
Alkali metals
Which are the most reactive nonmetals.
Halogens
Which are the least reactive elements?
Noble gases
A complete s and p sub level in the highest occupied energy level is called…
Stable octet
The s-block elements in Group 1A are called…
Alkali metals
A very reactive Group VIIA nonmetals with one electron short of a stable octet known as….
Halogens
Which elements are in Group IIIB through IIB, that are also called d-block elements?
Transition elements
Name Group VIIIA elements with a stable octet or duet.
Noble gases
The s-block elements in Group IIA is called….
Alkaline-earth metals
Elements with both metal and nonmetal properties, also called semi metals are called….
Metalloid
Who published the first Periodic Table of elements?
Mendeleev
Where was the location of the First International Congress of Chemists?
Karlsruhe
Who proposed the law of octaves?
Newlands
Who organized the elements into triads?
Döbereiner
Who presented a new method for determining atomic masses?
Cannizzaro
Who determined the positive charge of an atom?
Moseley
_________ are the electrons in the outermost energy level and are responsible for the ___________ of an element.
Valence electrons; physical properties
Inner elections do not have great effect on chemical properties because they rarely…
…come in contact with the atom’s environment.
The metalloid include the elements boron, silicon, ___________, arsenic, selenium, antimony, and __________.
Germanium; tellurium
Henry Morse used X-ray diffraction to determine the amount of ___________ in the nucleus of each atom.
Positive charge
Mendeleev based his Periodic Table of Elements on the atomic ________ of each element, but the modern Periodic Table is based on the atomic ________ of each element.
Mass; number
No two electrons in the same at can have the same four quantum numbers.
Pauli exclusion principle
An electron occupies the lowest energy orbital that can receive it.
Aufbau principle
The orbitals of equal energy are each occupied by one electron before any is occupied by a second electron.
Hund’s rule
The physical and chemical properties of the elements are periodic functions of their atomic numbers.
Periodic law
