Identify the correct statements about Boron. I. It has high melting point. II. It has high density. III. It has high electrical conductivity IV.   B - 10 isotope of it has high ability to absorb neutrons

Step-by-step solution

Due to very strong crystalline lattice, boron has unusually high melting point. Rest of the members are soft metals with low melting point and high electrical conductivity. The density of the boron family elements increases down the group due to increase in mass overcomes the increase in volume. The boron-10 ( B 10 ) isotope has high ability to absorb neutrons and, therefore, metal borides are used in nuclear industry as protective shields and control rods.