Answer:
d-block
Explanation:
Many scientists describe a "transition metal" as any element in the d-block of the periodic table, which includes groups 3 to 12 on the periodic table. In actual practice, the f-block lanthanide and actinide series are also considered transition metals and are called "inner transition metals".
Answer:
0.2g of hydrogen is needed to produce 1.80g of water
Explanation:

No. of moles of water
From given values,
Weight of water 
Molecular weight of water 
No. of moles of water
From equation, it is clear that 2 moles of water can be formed by 2 moles of 
Hence, 0.1 mole of water can be formed from 0.1 mole of 
Now,
No. of moles of 

Magnesium & Oxygen, because an ionic bond is a nonmetal and metal combined.
MG = metal
O = non metal
So makes an ionic .