Hydrogen bonds have H bonded to N, O or F
<span>(F-H, O-H, N-H) :)</span>
Answer:D
Explanation:
Menirals are obtained from the rocks..which contain elements in combined states,specialy metals.
These metals are then extracted and purfied by metallurgy
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Answer:
Caesium (55Cs) has 40 known isotopes, making it, along with barium and mercury, one of the elements with the most isotopes. The atomic masses of these isotopes range from 112 to 151. Only one isotope, 133Cs, is stable. The longest-lived radioisotopes are 135Cs with a half-life of 2.3 million years, ... It constitutes most of the radioactivity still left from the Chernobyl accident ...
Entropy is a measure of chaos or disorder in a system. For the first one, the system with the highest entropy is a cup of water at 0 degress centigrade. For the second question, the system with the lowest entropy is sugar crystals in 95 degrees centigrade cup of coffee.