Answer:
Valency of Chlorine is 1 because it needs 1 electron to complete its octet (a shell of eight electrons). Valency is defined as "The combining power of an element" and Since, chlorine needs 1 electron to complete its valence shell, Its valency is 1.
Answer:
14.06 M
Explanation:
Molarity: moles of a solution / liters of a solution
We convert 569ml into liters for the equation by dividing milliliters by 1000.
569/1000 = 0.569L
Now that we have Liters we can do moles of a solution / liters of a solution:
8 / 0.569 = 14.06 M
It stays roughly the same size. Electrons have a barely imperceptible mass so the overall mass of the atom is changed very little.
By nuclear fusion of hydrogen nuclei into Helium
Answer 1
The sample will dissolve in more than 1 minute.
Explanation :-
Generally Solubility and rate of solubility of substances increase with the increase in temperature. So lower the temperature less fast will it dissolve in the same amount of water.
Since at 50 C it takes 1 minute to dissolve, at 20 C which is lower temperature it will take more time to dissolve.
Answer 2
Transition metals
Explanation:-
Hardness depends on the extent of metallic bonding for metals. More the number of electrons more the metallic bonding.
Alkali metals with just 1 valence electron have weak metallic bonding. Alkaline earth metals have just 2 valence electrons. Transition elements has more electrons in penultimate shell and valence shell than lanthanides. Transition metals with most metallic bonding are the hardest
