QUESTION 1: Description: Radioactivity is found almost everywhere on the planet.
ID: 538600 • Letter: Q
Question
QUESTION 1:
Description: Radioactivity is found almost everywhere on the planet. For the most part, it is harmless. You can find it in things from exit signs which contain trace amounts of the hydrogen isotope tritium, to kitty litter, which often contains trace amounts of thorium.
Prompt: Many dinosaur bones are radioactive. Because of this, they are usually painted over with lead paint. Postulate a reason for why some of these very old fossils would have a radioactive signal and where it might be coming from?
QUESTION 2:
Description: The periodic table is a known staple in modern chemistry. At some point in your life you’ve heard about different trends on it from atomic mass to radii. In this discussion board we’re going to talk about exceptions to those trends.
Prompt: Electronegativity is supposed to go from left to right on the periodic table, but certain transition metals have higher electronegativity than the elements to the right of them. Propose a reason why and explain your answer.
Electroneqativity 0 Electronegativity Values B Be C1 He Li 1.0 Mg K Ca/ Sc Ti V RbSr Zr Nb Mo Tc Ru Al Si/ P Zn Ga Ge As Cd In Sn Sb Te Hg TI Pb Bi Po At Se 1.0-1.4 1.5-1.9 2.0-2.4 2.5 -2.9 Ru Rh Pd Bi PAtxe Rn 3.0 4.0 Fr Ra AcExplanation / Answer
question 1. this is due to the presence of radioactive urenium that deposited duding the dinosaur ages.
Question 2. this due to the electron cofiguration of the elements. such as Copper and zinc. although zinc is right to copper it is less electronegative than copper. here, zinc has 3d104s2 outer electron configuration and has very less affinity for electron. where as copper has 3d94s2 outer electron configuration and want to accept electron to get the d10 system which is very stable electron configuration. that is because copper is more electronegative than zinc.