What determines what needs the valency? Give the name of the following ions. Include the valency where needed. For example, leadV) a. Co2+ Cobalt ion b. Be2+ Beryllium(ll) c. Cu Copper(l) d. N Nitride ionx ion 3- ion Pa a. cobalt(II) ion b. beryllium ion c. copper(I) ion d. nitride ion Solution d block elements needs to be specified valency a) Co is d block element So, we need to mention valency Answer: Cobalt(II) b) Be is s block element So, we don’t need to mention valency Answer: Beryllium c) Cu is d block element So, we need to mention valency Answer: Copper(I) d) N is p block element So, we don’t need to mention valency Answer: Nitride .

1. What determines what needs the valency?
Give the name of the following ions. Include the valency where needed. For example, leadV) a.
Co2+ Cobalt ion b. Be2+ Beryllium(ll) c. Cu Copper(l) d. N Nitride ionx ion 3- ion Pa a.
cobalt(II) ion b. beryllium ion c. copper(I) ion d. nitride ion
Solution
d block elements needs to be specified valency
a)
Co is d block element
So, we need to mention valency
Answer: Cobalt(II)
b)
Be is s block element
So, we don’t need to mention valency
Answer: Beryllium
c)
Cu is d block element
So, we need to mention valency
Answer: Copper(I)
d)

2. N is p block element
So, we don’t need to mention valency
Answer: Nitride