The periodic table of elements

Group (family) properties

18 of these on the periodic table number from left to right atomic numbers and atomic masses increase as you move from the top down. I love this of elements in the same group have the same number of electrons in the outer orbitals or levels of their's. They're also known as valance electrons

Elements

A pure substance that is made up of one kind of Adam that cannot be broken down into simpler substances by physical or chemical means. 90 occur naturally on. 25 were made by scientists.

Periodic table of elements

A table of the elements, arranged by atomic number, that shows the patterns in their properties based on the periodic law

Mendeleev's predictions

Although his periodic table of elements are missing elements or gaps he was able to predict the characteristics of these missing elements because of periodic law

Physical properties of metalloids

Have properties of both metals and nonmetals

Metals

Are Atoms with few electrons in their outer energy level

Metalloids

Atoms with about one half complete outer energy

Nonmetals

Atoms with full or almost full outer energy levels

Metalloids

Border zigzag line or staircase on the periodic table

Physical properties of metals

Ductile, good conductors, malleable, Shiny, most are solid at room temperature

Chemical properties of metals

Has to you electrons in their outer energy levels suss lose electrons easily

Henry Moseley

In 1914 his work lead to a revision of the periodic table by rearranging the elements by their atomic number. He concluded that the number of photons in and Atom is its atomic number

Dmitri Mendeleev

In the 1860s he devised a periodic table with elements were ordered by their atomic masses. He did this by grouping elements together according to their similarities.

Periodic law

Mendeleev was able to predict the characteristics of missing elements because of this

Chemical properties of metalloids

Most Atomd have about half complete set of electrons in outer level

Chemical properties of nonmetals

Most have fall outer energy levels thus they tend to gain electrons some have completely full outer level

Nonmetals

Most sound to the right of the zigzag line or staircase on the periodic table

Physical properties of nonmetals

Not ductile or malleable not shiney and poor conductors most are solid but some are gas at room temperature

Periodic

Occurs at regular or at least generally predictable intervals

Periodic law

Physical and chemical properties of the elements are periodic functions of their atomic numbers

Period (row) properties

Seven. On a periodic table number from the top down. Atomic numbers and atomic masses increase as you move from the left to the right in the period. All atoms of the outlets in the same period have the same number of Orbitzal levels. All Adams of the element in a specific period have that respective number of orbital or levels

Metals

Sounds on the last of the zigzag lines staircase on the periodic table the exception is hydrogen only

How to calculate the number of protons neutrons and electrons while using the periodic table of elements

The number of protons is the same as the atomic number subtract the atomic weight and it's haven't number to find the number of neutrons. The number of electrons is the same as the protons unless it is an ion.

Mosley and medeeleev

The two scientists who contributed to the creation and revision of the periodic table

Metals, metalloids, nonmetals

Three classes of elements

Elements in a group

Usually have similar physical and chemical properties