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100

Chemistry who arranged the elements according to increasing atomic masses and thereby discovered the relationship that he called the law of octaves

John Newlands

100
Elements which are mostly geoloic minerals that are dissolved slightly in water

Alkaline-earth metals

100

The only metal liquid at room temperature

Mercury

100

Atomic radii does this when moving down a group or column in the periodic table

Increases

100

Property which measures the attraction of bonded atoms to electrons

Electronegativity

200

Credited with developing the first ordered table of elements

Dmitiri Mendeleev

200

Nitrogen, phosphorus, arsenic, antimony, bismuth, and moscovium

Pnictogens

200

Silvery luster, conducts electricity well, highly reactive

Alkali metal

200

High electronegativities are associated with large ionization energies and these

High electron affinities

200

Defined as the distance from the center of the atom's nucleus to its outermost electrons

Atomic radius

300

Work resulted in the revision of the periodic law and the atomic number being used as the organizing factor for the periodic table

Henry Moseley

300

helium, neon, argon, krypton, xenon, and radon

Nobel gases

300
Lightest and most abundant element in the universe, extremely flammable in air, used in the industrial production of ammonia

Hydrogen

300

A larger atomic radius means this ionization energy

smaller

300

Property measuring the energy required to remove an outermost electron

Ionization energy

400

Discovery that Henry Moseley used to determine the atomicnumbers of elements

x-rays

400

fluorine, chlorine, bromine, iodine, astatine

halogens

400

Exists as a diatomic or triatomic gas, accounts for approximately 21% of the earth's atmosphere; most abundant element in the earth's crust and is essential for life 

oxygen

400

A smaller atomic radius means this ionization energy

larger

400

Oxygen has the ability to combine with other elements to form these compounds

oxides

500

The first to use the term element to describe a list of 30 substances he deemed unable to be broken down into simpler substances

Antoine Lavoisier

500

lanthanoid and actinoid series

inner transition metals

500

The most reactive as well as the most electronegative element

fluorine

500

Because they have a similar electron configuration, elements in the same group have similar these

Physical and chemical properties 

500

Another name for semiconductors

metalloids