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A sounds right, it sounds familiar but can't say 100% it's correct
B can't be true because how do you know the properties of unknown substances yet discovered
C is impossible (since elements don't last very long anyways and i don't think mendelev was capable of creating elements)
#2: Which of the following elements have properties similar to those of astatine (At)? A. F, Br, I B. Ar, S, P C. F, Ar, Ne D. Na, Mg, Al **my answer; A is that right?
manmade elements don't last long*
okay :) so #1 is correct :) what about #2?
2A looks good, all 3 are in group 17 along with At
okay :) and #3? What is true of the ionic size of the elements in a group as one moves from top to bottom in that group? A. Ionic size stays the same within the group. B. Ionic size does not vary in any predictable way within the group. C. Ionic size decreases from top to bottom within the group. D. Ionic size increases from top to bottom within the group. **My answer: D. is that right?
do u get #3?
yeah i think they increase as you go from top to bottom http://en.wikipedia.org/wiki/Ionic_radius
kk so #3 is D?
kk thanks :)
kk thanks :)