Can anyone give me the Number of Valence Electrons for:
(The numbers afer the elements are what I found)
**Remember, I am not looking for someone to do my homework!!**
Oxygen-6
Aluminum-3
Calcium-10
Copper-4
Lead-5
Mendelevium-12
7th grade chem help!!
2007-04-03 14:18:26 · 3 answers · asked by ĦΛЏĢħŦŞŧμρђ 2 in Science & Mathematics ➔ Chemistry
O = 6 correct
Al = 3 correct
Ca = 2
Cu = 2, sometimes 1
Pb = 2, sometimes 4
Md = 2, sometimes 3
2007-04-03 14:23:02 · answer #1 · answered by steve_geo1 7 · 0⤊ 0⤋
Valence electrons are found in the s and p orbitals. They are the first 2 and the last 6 groups going from left to right on the periodic table. Find your element and count as you go across that row, for example: oxygen has six valence electrons. You can find that by locating the period it is in (horizontal row) and then counting across: Li, Be, B, C, N, O. For any elements in the 3rd through 12th group, (the transition metals), count just the 2 electrons at the beginning of the period.
2007-04-03 21:26:17 · answer #2 · answered by chemmie 4 · 0⤊ 0⤋
Generally, the group number indicates the number of valence electrons, except for the transition metals, they always have two.
Notice oxygen has 6 and is in the 6th group. The elements on the bottom also have two, since they are also in the transition metals.
2007-04-03 21:27:13 · answer #3 · answered by pacificislandr4 3 · 0⤊ 0⤋