5-1 Development of the Period Table

Mendeleev

Arranged elements by their atomic mass, and found there were periodic repetitions of the elements properties

Ductile

Ability to be drawn into fine wires

Malleable

Ability to be hammered into thin sheets

Semimetals

Also known as metalloids these elements have some properties of both metals and nonmetals, or have properties that are intermediate

Electronegativity

An atom's ability to attract electrons in a chemical bond

Newlands

Created the Law of Octaves, if you arranged elements in order by increasing atomic mass, characteristics of particular elements repeated themselves every 8 elements

Mendeleev

Created the first periodic table

Dobereiner

Created triads, sets of three elements that contained similar chemical properties

Atomic Radius

Distance from the center of an atom's nucleus to its outermost electron

Valence Electrons

Electrons that are largely responsible for an atom's chemical behavior

Valence Electrons

Elements in groups/families have similar properties because they have __________ in similar configuration

Nonmetals

Elements that do not possess a metallic luster, poor conductors of heat and electricity, and are neither ductile or malleable

Metals

Elements that have a metallic luster, conduct heat and electricity, solid, malleable, and ductile

Groups or families

Elements that have similar properties and are aligned in vertical columns (18)

Electron Affinity

Energy needed to add an electron

Ionization Energy

Energy needed to remove an electron

Moseley

Found that you arranged the periodic table by an element's atomic number not by its atomic mass

Periods

Horizontal rows in the periodic table (7)

Down and to the left

In which direction does an elements atomic radius increase?

Up and to the right

In which direction does an elements electronegativity increase?

Mendeleev

Left blank spaces in the periodic table, to predict the existence and properties of undiscovered elements

Periodic trends

Many properties of the elements change in a predictable way as you move through the periodic table, these changes are called?

Abbreviated Electron Configuration

To save space in writing electron configurations and to focus attention to valence electrons, chemists often use ______________

S Block

What block do families 1 and 2 lie in?

P Block

What block do families 13 - 18 lie in?

D Block

What block do families 3 - 12 lie in?

outer energy level

What do the elements in particular rows have in common?

Noble gas inner core

What does the (He) represent in the abbreviated electron configuration for Lithium (He)2s1?

Inner Transition Metals

What family is located in Block F of the periodic table?

Halogens

What family is located in the 17th column of the periodic table?

Noble Gases

What family is located in the 18th column of the periodic table?

Transition Metals

What family is located in the 3rd-12th column of the periodic table?

Alkali Metals

What family is located in the first column of the periodic table?

Alkaline-Earth Metals

What family is located in the second column of the periodic table?

Ekasilicon, Germanium, Germany

What was the name of Mendeleev's predicted element, what is it called now, and where was it found?

Periodic Law

When elements are arranged in order of increasing atomic number, their physical and chemical properties show a periodic pattern

F block

Which block do the Inner Transition Metals lie in?