Which of the following elements is a metal?

carbon (c)

iodine (i)

iridium (ir)

radon (rn)

The tendency of an element to loose an electron is called metallic property of that element. 1.Carbon has 4 valence electrons hence it's difficult to loose electrons. 2.Iodine has 7 valence electrons hence it will gain 1 electron and form octet. 3. Iridium has 2 valence electrons so it will loose electrons and gain stability. 4. Radon has 6 valence electrons hence difficult to loose electrons. So Iridium is the correct answer. Ping me for any questions. :-D

Natural selection makes it so that an organism from a species has a better chance of surviving than an organism in the same species, but with different traits. Survival of the fittest proves that certain traits can help an organisms survive better than its peers. For example, say there was an allele that made bears have thicker fur than others. The year-round climate is extremely cold. The bears with thicker fur are more likely to survive due to the warmth their fur provides and will have more offspring. The bears with thinner fur will die more often and not produce healthy offspring due to the frigid temperature. Eventually, the allele for thin fur will die out because the bears with these alleles cannot survive in their habitat.