Answer: A dune is a mound of sand formed by the wind, usually along the beach or in a desert. Dunes can also be formed by strong currents beneath the water.
<span>Colbalt-60 and iodine-131 are radioactive isotopes that are used in :</span><span>(3). Medical procedures</span><span>
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An ion must be shaped when a neutral atom picks up or loses electrons.
Since electrons convey a negative charge, picking up electrons will bring about the formation of a contrarily charged ion, or anion. Thus, losing electrons will bring about the formation of an emphatically charged ion, or cation.
For your situation, the sulfide anion, S^2−1, conveys a(2−) negative charge, which must imply that it picked up electrons.
All the more particularly, it picked up 2 electrons. A neutral sulfur atom has an atomic number equivalent to 16, which implies that it has 16 protons inside its nucleus and 16 electrons encompassing its nucleus.
For every electron picked up, the ion's general charge diminishes by 1 unit, which additionally affirms the way that the unbiased sulfur atom picked up 2 electrons to get the (2−) charge.
Answer:
(a) The arrangement of metals in a vertical column in the order of decreasing reactivities is called reactivity series. The reactivity series follows the order:
