Ions and formulas Flashcards
What electronic structures do ions have?
Those of a noble gas.
What elements readily form ions?
Those in groups 1, 2, 6 and 7.
What are group 1 and 2 elements?
Metals.
What do group 1 and 2 elements do when forming ionic compounds?
They lose electrons to from positive ions.
What do group 1 elements (the alkali metals) do when forming ionic compounds?
They form ionic compounds with non-metals (halogens) and the alkali metal ion has a 1+ charge.
What are group 6 and 7 elements?
Non-metals.
What do group 6 and 7 elements do when forming ionic compounds?
They gain electrons to from negative ions.
What do group 7 elements (the halogens) do when forming ionic compounds?
They form ionic compounds with metals (alkali metals), where the halide ion has a 1- charge
What is the charge in the ion the same as?
The number of electrons it loses or gains.
What does LEPGEN stand for?
Lose Electron Positive Gain Electron Negative
What elements will only from ionic compounds?
Those at the opposite sides of the periodic table.
What are ionic compounds made up of?
A positively charged part, and a negatively charged part.
What is the overall charge of any compound?
Zero.
If the overall charge of any compound is zero what does that mean?
That all the negative charges in the compound must balance all the positive charges.
What can you use the charges on the individual ions present to work out?
The formula for the ionic compound.
