Answer:
Iodine
Explanation:
Iodine is in group 17 on the periodic table (first picture attached). The second picture shows you in the top left-hand corner of Iodine's little square, there is the number 53. This is the atomic number, it is also the number of protons and electrons in an element.
Hope this helped :)
Answer:
Basing on explanations below;
1. Endothermic reactions have a positive enthalpy while Exothermic reactions have a negative enthalpy.
2. Endothermic reactions take place in high temperatures while Exothermic reactions take place in low temperatures.
Answer:
126.86
Explanation:
Iodine-127 (80%)
Iodine-126 (17%)
Iodine-128 (3%)
For a mixture of isotopes, the average atomic mass is obtained by summing the multiplication of the atomic mass and percentage composition of the individual isotopes. This is given as;
Average Atomic Mass = ( 80 / 100 * 127) + (17 / 100 * 126) + (3 / 100 * 128)
Average Atomic Mass = 0.8 * 127 + 0.12 * 126 + 0.03 * 128
Average Atomic Mass = 101.6 + 21.42 + 3.84 = 126.86
Collect the salt water and put it in something where it can boil under fire or any other heat source capable to bring the water to boiling temperature. You can consume the collected water safely , but wait for its temperature to fall, except if you need it to be hot.
