also...how do u use the name of an ionic compound to deduce it's formula?
PLZ HELP!!!!!!1
2007-06-01 04:37:01 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
If it's a cation (metal), then the charge it adopts depends on which column it's in. Lithium, for example, is in column (group) 1, reading across from left to right. Therefore, it forms Li^+ ions.
Magnesium is in group 2, so it forms Mg^2+.
Metals in the transition (d-block) group, such as copper or iron, cannot be predicted in this way, though they usually are stable as variously +1, +2 or + 3 cations.
For anions, read across the table from left to right, (ignoring the last column on the right, which is the noble gases). For example, Fluorine is in the first column on the right (after the noble gases), and therefore forms F^-. Oxygen is in the second column along, and therefore forms O^2-.
This rule doesn't apply rigidly once you get towards the middle of the table.
2007-06-01 04:53:46 · answer #1 · answered by Ian I 4 · 0⤊ 0⤋
Based on its position in Group 6 or16 (depending on the version you use) of the Periodic Table an oxygen atom will have 6 electrons in its last energy level/shell so requiring 2 more electrons, each with a charge of 1-, to make 8 and a full last energy level/shell. This will give it a charge of 2- Oxygen atom O Oxide ion O^2-
2016-05-18 05:54:03 · answer #2 · answered by ? 3 · 0⤊ 0⤋
well all atoms want to have a full valence shell like the nobel gases. if you have to gain electrons (go to the right) the charge on the ion is negative. if you give up electrons (go to the left) like the group 1 & 2 the ions is positive.
So if you had NaCl
Na is group 1 so if it loses an electron it's happy. charge: +1
Cl is in group 7 so if it gains an electron it's happy. charge: -1
2007-06-01 06:37:58 · answer #3 · answered by shiara_blade 6 · 1⤊ 0⤋
the group of an element represents the number of electron valence for that element. for example, chlorine is in group 7.. so it has 7 electron valence. To obtain an octet configuration, it needs to gain an electron... so the charge for chlorine ion is -1...
2007-06-01 04:54:19 · answer #4 · answered by godrics 2 · 0⤊ 0⤋
The position gives an indication of the oxidation states possible.
Lower states end in -ous, higher states end in -ic.
2007-06-01 05:10:21 · answer #5 · answered by ag_iitkgp 7 · 0⤊ 0⤋