Atoms and Compounds

​Atomic model

September 13, 2022​

​What is matter?

Matter is any substance that has mass and takes up space.

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Open Ended

What are the THREE states of matter?

Open Ended

Give ONE example of EACH state of matter.

​lesson objectives

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Recall the model for particles in solids, liquids and gases Recall the sub-atomic particles and their properties Describe the Dalton and Modern model of the atom Recall what an element, compound and atom are Identify and draw elements, compound and mixtures in particle diagram Compare element compounds and mixtures

Science

​The particles in solids are close together which allows little to no movement. Solids have a fixed shape and volume.

Solid

The particles of solid are not closely packed which allows little movement. Liquids takes the shape of the container.

Liquid

​The particles are further apart. Gases fill its container.

​​Gas

​Let's get a better understanding!!

States Of Matter - Solids, Liquids & Gases | Properties of Matter | Chemistry | FuseSchool - YouTube

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​what is an atom?

The atom is the smallest particle into which an element can be divided without losing its chemical properties. Atoms are microscopic. A Greek philosopher called, Democritus was the first person to use the term atom.

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Atomic structure refers to the structure of an atom comprising a nucleus (centre) in which the protons (positively charged) and neutrons (neutral) are present. The negatively charged particles called electrons revolve around the centre of the nucleus.

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​Atomic structure

Multiple Choice

How many electrons can be on the first shell?

• 1

• 3

• 2

• 8

Multiple Choice

Who was the first person to mention 'atoms'?

• Demetrious

• Mendeeleev

• Cleopatra

• Democritus

dalton and the modern model of an atom

The English chemist John Dalton suggested that all matter is made up of atoms, which were indivisible and indestructible. He also stated that all the atoms of an element were exactly the same, but the atoms of different elements differ in size and mass.

Chemical reactions, according to Dalton’s atomic theory, involve a rearrangement of atoms to form products. According to the postulates proposed by Dalton, the atomic structure comprised atoms, the smallest particle responsible for the chemical reactions to occur.

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