7. Which elements did Mendeleev leave spaces for in his 1st periodic table:
a) aluminum & phosphorus
b) aluminum & germanium
c) silicon & arsenic
d) gallium & germanium
e) gallium & aluminum
2007-10-19 05:28:22 · 4 answers · asked by Rachel x0x Baby 1 in Science & Mathematics ➔ Chemistry
HE initially left a double gap that was later filled by gallium and germanium. He also left off all of the noble gases, but then no one knew about them at the time.
2007-10-19 05:40:02 · answer #1 · answered by T.W. S 2 · 0⤊ 0⤋
this is in basic terms a merciless way of coming up your self look clever S M R T Tina thinking decrease back however 20 plus years so which you will ought to excuse me yet this isn't my field of learn, yet i presumed the frequency or hertz refers to what proportion waves consistent with 2nd and fairly would not result the wave length in simple terms what proportion consistent with term, so in the journey that your wave slows down would not that advise the frequency had to have exchange. Tina This makes my head harm.
2016-12-15 03:55:41 · answer #2 · answered by ? 4 · 0⤊ 0⤋
gallium and germanium
2007-10-19 05:39:50 · answer #3 · answered by haile d 3 · 0⤊ 0⤋
D, and one or two others...
http://www.aip.org/history/curie/periodic.htm
2007-10-19 05:41:38 · answer #4 · answered by hcbiochem 7 · 0⤊ 0⤋