Question

Consider an ion with the symbol Y 3— formed from a representative element. (5.2, 5.3)

Required:
a. What is the group number of the element?
b. What is the electron-dot symbol of the element?
c. If Y is in Period 3, what is the element?
d. What is the formula of the compound formed from the barium ion and Y?

Answer 1

a) group 15

b) see diagram attached

c) phosphorus

d) Ba3Y2

Step-by-step explanation:

Elements in group 15 have five valence electrons. To complete their octet, they can accept three electrons from other chemical species to form a trivalent anion such as Y^3-.

If Y^3- is in period 3, the element must be phosphorus. Also, considering that the valency of Y^3- is -3 and that of barium is +2, a compound formed between the both elements will have the symbol Ba3Y2.