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True or False
There are 2 main classifications of elements


True/ Falso
More than 3/4 of the elements in the periodic table are nonmetals


Group 1 elements (except for Hydrogen) are known as Alakli Metals
True/ false


Group 13 elements are known as alkaline earth metals.


Group 17 elements are very highly reactive nonmetals known as halogens
True/ False


group 18 elements are known as transition metals.
True/ False


Metalloids have properties of both metals and inner transition metals
true/ false


a column on the periodic table


a row on the periodic table

representative elements

elements in groups 1, 2 , 13 to 18


elements that are shiny and conduct electricity

transition metals

elements in groups 3-12

outer edge

atomic radii cannot be measured directly because the electron cloud surrounding the nucleus does not have a clearly defined


A ____ is an atom, or bonded group of atoms that has a positive or negative charge

valence electrons

elements in the same group have the same number of


most of the elements in groups 16-18 are classified as


wha is the trends in atomic radii as you move from left to right across a period?

shielding by inner electrons

the trend in the atmic radii as you move down the group 1 elements is due to


How many electrons does an atom need in its outer level to be the most stable?

J.W. Dobereiner

A German chemist that observed that several elements with similar properties could be classified into sets of 3 Triads

J.A.R. Newlands

Found that when he arranged elements in increasing atomic mass the properties would be similar ever 8th element.


In 1865 there were ____ known elements.


_________ is credited as the father of the periodic table because he was the first to publish and demonstrate his table


He arranged the elements by increasing atomic mass.


He placed elements with similar reactivity and properties in columns.


He also left gaps to indicate that an undiscovered element should be there.

H.G.J. Moseley

_______________ an English chemist developed the concept of atomic number.

Periodic law

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

Groups or Families

_______________ the elements with similar properties and are aligned in vertical columns (18)


___________ the horizontal rows (7)

Traditional or Roman

____________ Roman numerals and letters


_________ numbers and letters


_______ numbers 1-18

Alkali Metals

(group 1A except hydrogen) -
Highly reactive
Found in nature in compounds

Alkaline Earth Metals

(group 2A)
Highly reactive
Important minerals

Transition metals

(B groups) -
Found in the middle of the periodic table
Innertransition Metals (2 pulled out rows)
Lanthanide series
Actinide series


(group 7A)
Very reactive nonmetals
Are often found in compounds (salts)

Noble gases

(group 8A)
Very unreactive nonmetals
They seldom form compounds

S- block

group 1A and 2A and helium

P- block

group 3A to group 8A


transition metals, the middle of the periodic table. It contains a few exceptions.


innertransition metals, the 2 rows under the table. The electrons of the f sublevel do not fill their orbitals in a predictable manner.


Atoms can gain or lose electrons to form a ___

Octet rule

________________-atoms tend to gain, lose, or share electrons in order to acquire a full set (8) of valence electrons.


Ionization energies ________ as you move down a group


Ionization energies _________ as you move from left to right across a period.

Successive ionization energy

The energy required to remove electrons beyond the 1st electron.

Electron affinity

The energy change that occurs when an atom gains an extra electron


A measure of the ability of an atom in a chemical compound to attract electrons.


Increase as you move from left to right across a period. Except Noble gases
Decrease as you move down a group.


The most electronegative element is ________


The Law of Octaves did not work for every known element. True/ False


The first periodic Table is creddited to

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