Monday
September 22, 2014

Homework Help: Chemistry

Posted by Lil Mama on Saturday, November 18, 2006 at 7:57pm.

I have a series of questions:
What describes the arrangement of elements which repeat similar properties? Isn't the answer periodic table.
next question
who is the father of modern day periodic based on x-ray diffraction? Isn't the answer Dmitri Mendleev
next question
when the valence is filled what do we call it? Isn't the answer inner electron
nest question
what are the generalization of ionization energy, electron affinity, and electronegativity on the periodic table? I can't even guess at this one.

1.the Table has different colors, look at the key that tells you what they are, what is the title of that key?
2.
3.
4. what are the reasons for the color and position of elements in the table?

I have a series of questions:
What describes the arrangement of elements which repeat similar properties? Isn't the answer periodic table. The columns or groups in the periodic table.
next question
who is the father of modern day periodic based on x-ray diffraction? Isn't the answer Dmitri Mendleev Mendeleev is given the most credit for initial development of the modern periodic table but Meyer developed a periodic table about the same time. Both were based on atomic masses. Neither, however, was based on x-ray diffraction for that was unknown at the time. Moseley is the one who showed that the table increased as a function of atomic number (number of protons in the nucleus) and not atomic mass. As Bob Pursley pointed out in an earlier post today, however, Moseley had no illusions about being "father" of the modern periodic table and I have never seen that in print either.
next question
when the valence is filled what do we call it? Isn't the answer inner electron Bob Pursley addressed this question earlier by saying he didn't understand what valence filled means. Neither do I. You probably are thinking that when the outer shell is filled it is the noble gas structure.
nest question
what are the generalization of ionization energy, electron affinity, and electronegativity on the periodic table? I can't even guess at this one.
Ionization potential decreases as we go from top to bottom and from left to right on the peridic table. Electronegativity decreases as go from top to bottom and left to right. Electron affinity is essentially the reverse of EN.

I did EN wrong. EN decreases from top to bottom and from right to left. I didn't proof until I had posted.

I llov drbob222!

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