atomic structure and the periodic table - chemistry

Define an atom

The simplest form of an element

Define element

A substance made from one type of atom

Define compound

A substance made of two or more different atoms , chemically bonded

Define molecule

A substance made from 2 or more atoms , chemically bonded

Define a mixture

A substance made of more than one substance not chemically bonded

Define pure

One type of substance

How to separate a insoluble solid from a liquid

Filtration

How to separate pigments

Chromatography

How to separate a substance from a solution whilst keeping the solution

Distillation

Scientist responsible for SIMPLE BALL MODEL

John dalton

Describe plum pudding model

Ball of positive charge with negative electrons studded

Scientist responsible for plum pudding model

J.J Thomson

Gold foil experiment proved what?(geiger and marsden)

Dense nuclei with positive charge

Most of atom is empty

Who proposed the nuclear model

Rutherford ( Geiger and marsden also)

Who discovers the neutron

Chadwick

How are elements arranged in the periodic table

Increasing atomic number

Why is there only 2 in the period 1

The first she’ll only holds 2 electrons, once it’s full a new period starts

How did Mendeleev arrange the elements

Atomic weight

Why did Mendeleev swap elements around

Similar chemical properties could be together

Define inert

Unreactive

Metal( group 1) + oxygen

Metal(group 1)+ chlorine

Metal(group1) + water

Metal oxide

Metal chloride

Metal hydroxide+ hydrogen

Why is Group 1 is called alkali

When they react with water they form an alkaline solution

Group 7 aka

Halogens

Define displacement reaction

A more reactive element take place of the less reactive element in a compound