Question

An element with atomic number 5 belongs to III A group of the modern periodic table find:
(i) The number of valence electrons
(ii) Valency
(iii) Metal or non metal or metalloid
(iv) Name of the element
(v) Hydride of element
(vi) oxide of element

Answer 1

Answer:

1. 3

2.3

3. Metal

4. Boron

BH3

B2O3

Explanation:

That's it!

Answer 2

Boron ( B)

Explanation:

Given element has atomic number 5.

We infer:

Boron is the element. Its symbol is B and its atomic mass is 10.811.

(i) Electronic configuration is: 2, 3.

Boron has 3 valence electrons in its outer shell.

(ii) Valency: It will lose 3 electrons to complete its octet. Hence its valency is +3.

(iii) Boron is the only non-metal of the Group 13 of the periodic table.

(iv) Boron is the element. Its symbol is B and its atomic mass is 10.811.

(v) Hydride: Boranes is the name given to the class of synthetic hydrides of boron with generic formula BxHy.

(vi) Oxide: The oxide of boron, boron oxide, will have the formula B2O3.