What changes when moving left to right on the periodic table?
2006-09-16 11:54:09 · 3 answers · asked by Anonymous in Education & Reference ➔ Homework Help
In regards to chemical activity
2006-09-16 11:59:19 · update #1
As you move from left to right, the number of valence electrons in the atom increase. Once you hit 8, the valence is full and another valence starts with 1.
So, elements directly underneath each other have the same number of valence electrons (carbon and silicon, for example) and have similar properties because of this. (Carbon has 6, silicon as 14, which is just 8 + 6 - one full valence of 8 and another with only 6, just like carbon.)
At the far right of the table, the elements have all 8 of their valence electrons in place. These are called the noble gases (xenon, neon, argon, etc.)
Sorry this is a little sketchy but hope it helps
2006-09-16 12:22:15 · answer #1 · answered by Anonymous · 0⤊ 0⤋
The number of electrons in the valence shell (more electrons as you move to the right). This in turn changes the atomic weight (slightly) as more electrons means more mass. And if I'm not mistaken, the size change would be: smaller on the left and larger on the right (I could be wrong, college chemistry was a LONG time ago).
2006-09-16 18:59:10 · answer #2 · answered by homeschoolmom 5 · 0⤊ 0⤋
the size of the atomic molecule
generally goes from left to right, biggest being at the left... smaller at the right
2006-09-16 18:57:29 · answer #3 · answered by Anonymous · 0⤊ 0⤋