Formula and equations - 2.3 - (1)
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How do atoms achieve the same electron structure as the nearest noble gas, helium (He) to radon (Rn)?
by losing or gaining electrons
What do atoms of metals on the left of the periodic table lose to form cations (positive ions)?
electrons
What do atoms of non-metals on the right of the periodic table gain to form anions (negative ions)?
electrons
For many elements, what can you use to work out the likely charge on the ion?
the element’s position in the periodic table
What can some metals, mostly transition metals, form?
several ions with different charges
How is the ionic charge shown?
with a Roman numeral in the name of the ion
What does a binary compound contain?
two elements only
To name a binary compound, what do you need to do?
use the name of the first element but change the ending of the second element’s name to -ide
For ionic compounds, what always comes first?
the metal ion
Example: sodium and oxygen form…
sodium oxide