Question

Which is the element with atomic no. 5? Write about it.

✓ Write well.

✓ Best answer- gets brainliest

Answer 1

5. Boron
B is the 5th atomic no

Answer 2

The fifth element of the modern periodic table is Boron.

Its atomic number is 5 and atomic mass is 10.811 u ± 0.007 u.

It is denoted by the letter B.

It is a metalloid.It is located in the group 13 period 2 of the modern periodic table.

It has a valency of +3.

Boron is not present in nature in elemental form. It is found combined in borax, boric acid, kernite, ulexite, colemanite and borates.

Most of the boron that is mined is eventually refined into boric acid or borax. Boric acid is used in a number of applications including insecticides, flame retardants, antiseptics, and to create other compounds.Boron is also used to manufacture glass and ceramics.

Boron has two stable and naturally occurring isotopes, Boron-10 and Boron-11