considered generally as the "father" of the periodic table
What is Dmitri Mendeleev
100
a positively charged ion
What is cation
100
This elemental family forms +2 ions
What is alkaline-earth metals.
100
Reactivity increases as you move down this group
What are alkali metals
100
the second most abundant element found on the Earth's crust
What is silicon
200
Mendeleev believed certain properties repeat periodically when the elements are arranged horizontally in order of ________________.
What is atomic weight
200
an atom or group of atoms that has lost or gained one or more electrons
What is an ion.
200
These have high melting points and tend to lose electrons
What are metals
200
This elemental family contains the actinides which are all radioactive and commonly used in medicines and nuclear reactions.
What are transition metals
200
this elemental family form -1 ions
What are halogens
300
the arrangement of elements in order of the number of protons, in which properties occur in a regular pattern
What is periodic law.
300
Hydrogen has three isotopes: the protrium, the deuterium, and the ________________.
What is tritium - (has 2 neutrons and 1 proton inside the nucleus)
300
May be solids, liquids, or gases and are considered brittle, dull, and poor conductors
What are non-metals
300
this elemental family can easily combine with other elements to form compounds - such as milk of magnesia or calcium oxide
What are alkaline-earth metals
300
a diatomic molecule as a gas located on the metals side of the periodic table
What is hydrogen
400
This scientist found that the progression of the elements in the periodic table correspond to an increase of one fundamental unit in the nucleus and that each element could be assigned an atomic number equal to the number of these units.
Who is Henry Moseley
400
this refers to how common an isotope is found in nature
What is relative abundance
400
can display metallic and non-metallic properties based upon certain conditions
What are semiconductors or metalloids
400
the ability to lose electrons
What is ionization energy
400
this elemental family has complete octet configurations
What are noble gases
500
This scientist announced the existence of the __________, Moseley's fundamental unit.