Ionic Compounds

How do metal atoms form ions?

• They lose electrons to form negative ions

• They gain electrons to form positive ions

• They lose electrons to form positive ions

• They share electrons with other atoms

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Which of these statements about a negative ion is true?

• It has an equal number of protons and electrons

• It has more protons than electrons

• It has more electrons than protons

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Iodine is in Group 17 of the periodic table. What is the charge on its ions?

• -1

• -2

• 1

• 2

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A magnesium ion has the formula Mg²⁺. What is the electron arrangement of the ion?

• 2.8

• 2.8.2

• 2.8.4

• 2.8.8

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What type of forces hold on an ionic lattice together?

• Electrostatic attraction forces

• Covalent bond

• Metallic bond

• Van der Waals forces

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A diagram of part of the crystal of calcium chloride shows 15 calcium ions and 30 chloride ions. What is the formula of calcium chloride?

• CaCl

• CaCl₂

• Ca₂Cl

What properties does an ionic compound have?

• A low boiling point and it conducts electricity when dissolved in water

• A high melting and it conducts electricity when liquid

• A high boiling point and it conducts electricity when solid

Sulphur is in Group 16 of the periodic table. What is the formula of its ion?

• S^6-

• S⁶⁺

• S^2-

• S

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An ion has the formula Ba²⁺. What group of the periodic table is its element in?

• 1

• 2

• 12

• 16

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Ionic compounds conduct electricity when dissolved in water. Which statement below best explains the property?

• Ions are free to move.

• Electrons are free to move.

• Bonds are strong.

• There are weak intermolecular forces of attraction.