8. Transition metals
9. Halogens
10. Nobel gasses
11. Lanthanides
12. Actinides
13. The tendency of a substance to undergo chemical reaction, either by itself or with other materials, and to release energy.
The answer is tree even tho it was already answered
Answer: N-N: 145 pm and 167 KJ/mol
N=N: 125 pm, 418 KJ/mol
And N2: 110 pm , 942 KJ/mol
Explanation: Bond length is inversily proportional to bond energy.
Greater the bond length , smaller the bond energy and vice-versa.
Answer:
The pH of the solution is 8, 40-
Explanation:
The pH indicates the acidity or basicity of a substance. PH values between 0 and less than 7 indicate acidic solutions, 7 neutral and greater than 7 to 14 basic. It is calculated as
pH = -log (H30+)
pH= -log (4x10-9M)
<em>pH=8,40</em>
Answer: 28.5 g
Explanation:
1 mole of every substance contains Avogadro's number of particles and weighs same as it's molecular weight.
Here 1 mole of 
contains 
molecules of and it weighs 
molecules weigh 44g
molecules weigh = 
= 28.5g
