The Periodic Table

Mendeleev listed the elements in order of their atomic masses.

What determines the order of the elements in the modern Periodic Table?

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Mendeleev predicted the properties of the undiscovered element X. You will find element X in the table above.

Study the pattern in which the elements are arranged in the table above. Deduce to which Group in the modern Periodic Table element X belongs.

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Describe two other differences between Mendeleev’s original Periodic Table and the modern Periodic Table.

State the name of the block of elements in the modern Periodic Table which includes iron, cobalt and nickel.

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Describe the trend in the reaction of these elements with water.

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Write an equation for the reaction of sodium with water.

The melting points of lithium, sodium and potassium are:

Predict the melting point of rubidium.

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What is the formula of argon gas?

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Titanium is extracted from titanium(IV) chloride by reduction with molten sodium in an argon atmosphere and not in air.

Suggest why this reaction is carried out in an argon atmosphere and not in air.

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State one other use of argon.

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State two trends in the properties of the alkali metals.

1. ______
2. ______

Name the products formed when rubidium reacts with water.

______ and ______

How many electrons are in there in the outer shell of a francium atom?

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Predict two physical properties of francium.

1. ______
2. ______

A scientist predicts that francium reacts violently with water.
Write the equation for this reaction.

What is the formula for an astatide ion?

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Complete the table about the appearance at room temperature of the elements in Group VII.

Predict the appearance of astatine at room temperature.

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Describe what you would see.

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Construct the ionic equation for the reaction that takes place.

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Explain why astatine will not react with aqueous potassium iodide.

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State two physical properties of lithium.

1. ______
2. ______

Describe what is observed during this reaction.

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Complete the table by estimating

• the boiling point of bromine
• the density of liquid chlorine at its boiling point.

Use the information in the table to suggest the colour of astatine.

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Construct the ionic equation for this reaction.

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Explain why potassium chloride does not react with iodine.

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is in Group III and Period 4 of the Periodic Table,

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has atoms with 8 electrons in their outer shell,

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is a liquid at room temperature,

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forms an ionic chloride with the formula $\text{XCl}_2$,

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is used in light bulbs?

______

Construct the equation for this reaction.

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Explain why bromine does not react with aqueous potassium chloride.

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Give the charge of a chloride ion and its electronic configuration.

charge ______
electronic configuration ______

Describe the general trend in the density of the Group I metals.

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Predict the boiling point of potassium.

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Describe the trend in reactivity of the Group I metals with water.

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Construct the equation for the reaction of rubidium with water.

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Describe two other differences in the physical properties of sodium and nickel.

1. ______
2. ______