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patriot [66]
3 years ago
7

Mendeleev's overall arrangement of elements in the periodic table is based on

Chemistry
2 answers:
Serhud [2]3 years ago
7 0
It is based on collumns and reactivity of the element, the ones on the far right (column 1,2 and 3) are all metals, the ones in the middle (columns 4,5,6 and 7) are physical matters and the ones on the far right (columns 8 and 9) are all gasses, hope this helps
shusha [124]3 years ago
5 0
Repeated patterns in the elements. 
Hopefully this helps
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 <span>Calculating average atomic mass is exactly like calculating a weighted average. Perform the following calculation: 

(mass1)(percentage1) + (mass2)(percentage2) = average atomic mass 

(35.0)(0.75) + (37.0)(0.25) = average atomic mass 

Make sure your percentages are in decimal form for this calculation. 

One of the other answers given is correct, though the explanation is lacking a bit. Two of the answers can be eliminated immediately: 35.0 amu and 37.0 amu cannot be the average. If the mixture of isotopes was 50% and 50%, then 36.0 amu would be correct; however, the mixture is 75/25. This leaves only one possible answer choice.</span>
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