Answer:
Group 13
Explanation:
We have been given some properties of the elements we desire to identify.
The most important and by far unique is the oxidation state of the ions given. This reflects the amount of electrons an atom has lost or gained.
Group 1 and 2 elements have oxidation states of +1 and +2 respectively. This is a very perculiar property of these metals. When group 1 elements lose an electron, nobility is achieved and this goes for group 2 elements too.
Group 12 consists of transition elements. Most transition elements are known to have variable oxidation states. In this group, the common oxidation state is +2.
Group 13 elements have two dominant oxidation numbers which are +1 and +3. Particularly, Aluminum has +2 oxidation state too.
The properties fits in well for aluminum which is a group 13 element.
Answer:
When a copper is drawn into wire the only change that occurs is change in its shape and size no change will take place into its composition that is the wires are still possessing the properties of copper metal. Thus, a physical change takes place when copper is drawn into wire.
The reason why perchloric acid is more acidic that ethane is because the hydrogen in perchloric acid is bonded to oxygen which is more electronegative than carbon.
The acidity of a substance depends largely on the ease with which the X-H bond is broken. If the electron density is tilted towards the atom X, then the X-H bond is weaker and the substance is more acidic.
The polarity of the X-Y bond depends on the electronegativity of X. In the case of perchloric acid and ethane, oxygen is more electronegative than carbon hence the O-H bond in perchloric acid is more easily broken than the C-H bond in ethane.
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1 calorie is equal to 4.184 Joules.