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Describe the structure of an atom.

Atoms are the smallest basic unit of matter.

Describe what is meant by the term element.

One particular type of atom, cannot be broken down into a simpler substance by ordinary chemical means.

Give examples of elements.

Hydrogen, oxygen, gold, and aluminum.

What is the difference among atoms that make one element different from another element?

The number of protons or neutrons it has.

What determines the properties of elements?


Define compound and give an example.

Compound: a substance made of atoms of different elements bonded together by covalent bonding. Example: Water and Carbon dioxide.

Define ion.

Ion: an atom that has gained or lost one or more electrons.

Explain how ions are formed.

Ions are formed when electrons are transfered from one atom to another.

Give examples of positive ions and negative ions.

Positive: When it loses 1 electron (on the outer)

Explain how ionic bonds are formed.

They form through the electrical force between oppositely charged ions.

Explain how covalent bonds are formed.

When atoms share a pair of electrons.

Define molecule and give an example.

Molecules: 2 or more atoms held together by covalent bonds. Example: Oxygen.

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