Give an example of two metals and non-metals that don't have the usual properties. Why are they so unusual.

Metals is defined as the solid material which shows lustrous appearance and is a good conductor of electricity while non-metal are defined as the material which are not in solid form, have no luster and are bad conductor of electricity.

Two metals which are so unusual are mercury and sodium because metals are generally solid bur mercury is present in liquid form and metals are hard but sodium is so soft.

Two non-metals which are so unusual are diamond and iodine because diamond is opposite to the property of non-metals that is hard and iodine shows lustrous appearance whereas non-metals are non- lustrous.

Hence, Two example of metals are mercury and sodium and two example of non-metals are diamond and iodine.

0.11 m/s and 0.28 m/s should be correct

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.