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periodic table and atomic structure

what is an element?

They are only made of one type of atom

what is a compound?

A compound consist of two or more elements that are chemically combined

what is a Mixture

A mixture consist of two or more elements or compounds that are not chemically combined

what are properties of alkaline metals?

They are soft and can be cut with a knife.
The softness increases going down the group.

They have a low density.

They have a low melting and boiling point.

They conduct electricity.

They are shiny when freshly cut

what are properties of transition metals?

They are hard and good conductors
They are unreactive

They are malleable and ductile

They have a high density in high melting point and boiling point

what are properties of noble gases?

They are colourless odourless and unreactive

what are properties of halogen?

They are very reactive and toxic or harmful because they are so Reactive
Halogen react with metal to form ionic compounds they gain one electron forming a positive Ion

what does the periodic Table, tell us

The group that an element is and tells us the number of electrons in the outer shell
The period that that element in tells us how many electrons shells that element has

The first shell could have maxed two electrons

The second shell can have max eight electrons

what is an ion?

An iron is a particle that has a charge they are electrically charged because they have an imbalance of protons and neutrons

what is an isotope?

An isotope is an element with the same number of protons but different number of neutrons isotopes have different physical properties but the same chemical properties

what did Newlands do?

Newlands followed the law of octaves. Some element elements in the same group didn't have the same properties ordered the elements by increasing atomic mass.

what did Mendel leave do?

Mendel leaf group the elements with similar properties left gaps so undiscovered elements could be fitted. He swapped some elements so they fit in the right group.

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