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Elements mixtures componds

Terms in this set (23)

Are the smallest unit of an element that maintains the properties of that element

is made up of one or more of thr same kind of atom chemically combined

Is made up of different kinds of atoms chemically combined

Contains a variety of elements and compounds that are not chemically combined with each other

Pure substances

A pure substance is a substance that has a definite physical and chemical properties such as appearance, melting point and reactivity

A mixture is one that does not have a uniform composition

Each part of the sugar-water mixture has the sweet taste

These negatively charged particles later becomes know as.....

A small dense center that has a positive charge and is surrounded by moving electrons

He called the positively charged particles in the nucleus called protons

James Chadwick was Rutherford's student in 1932 Chadwick discovered that the nucleus contains uncharged parts called neutrons

Instead the current theory suggests that electrons move within an area around the nucleus called the electron cloud

The number of protons in the nucleus of an atom is the atomic number

For this reason Mendeleev's arrangement of the elements became known as the periodic table

Chemical symbol

Is an abbreviation for the element's name

Metals are elements that are shiny and conduct heat and electricity well

Metalloids are elements that have some properties of metals and some properties of nonmetals

Each vertical column of elements from the top to the bottom on the periodic is called a group

Each horizontal row of elements from left to right on the periodic table is called period

Contains a type of heterogenous mixture called a suspension

Tea is an example of a type of homogeneous mixture is called suspention

Colliods are a third type of mixture that falls somewhere between suspensions and solutions

Nonmetals are poor conductors of heat and electricity

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