Yr 9 Bonding Revision.

1. Elements in the same GROUP of the periodic table have ...

• The same number of shells/energy levels with electrons
• The same number of electrons in the outer shell
• The same number of full shells of electrons

2. Elements in the same PERIOD of the periodic table have ...

• The same number of full shells of electrons
• The same number of electrons in the outer shell
• The same number of shells/energy levels with electrons

3. Identity the group and period of an element with the following electronic configuration 2, 3

• Group 2, Period 3
• Group 3, Period 5
• Group 2, Period 5
• Group 3, Period 2

5. Which is the electronic configuration of Lithium?

• A
• B
• C
• D

6. Which pair of elements are in the same group

• 2, 8, 2 AND 2, 8, 3
• 2, 2 AND 2
• 2, 8, 2 AND 2, 2

9. Select the best definition of ION

• An atom or group of atoms that lost electrons and formed a positive ion
• An atom or group of atoms that lost electrons and formed a negative ion.
• An atom or group of atoms that lost or gained electrons and becomes charged
• An atom or group of atoms that gained electrons and formed a negative ion

10. How is the O²⁻ ion formed

• An atom of oxygen lost 2 electrons and formed a negative ion
• An atom of oxygen gained electrons and formed a negative ion.
• An atom of oxygen gained 2 ions and formed a -2 charged atom
• An atom of oxygen gained 2 electrons and formed a -2 ion

11. Why do group 7 elements form negative ions?

• Because they have 7 ions in the outer shell and gain 1 more to get a stable electronic configuration
• Because they have 7 electrons in the outer shell and gain 1 electron to make them happy
• Because they have 7 electrons in the outer shell and gain 1 more to get a full outer shell
• Because they have 7 electrons in the outer shell and gain 1 more to get a stable noble gas

12. Which is the electronic configuration of sodium ion?

• A
• B
• C
• D

14. How many PROTONS does ²⁴₁₂ Mg ²⁺ have? (your answer is only a number)

(a)