Answer:
Thus, helium has the largest first ionization energy, while francium has one of the lowest.
<h3>ANSWER:</h3>
(C) KBr
<h3>EXPLANATION:</h3>
An ionic compound is made up of a metal and a nonmetal. K is a metal while bromine is a nonmetal. Thus K transfers its one electron to bromine in order to form an ionic compound.
First you need to work out what mass of 84g of stainless steel is nickel, and because there's 5% you can simply divide by 20, giving 4.2g
For this you can use the equation

The mass, as was worked out previously, is 4.2g
The Mr, which is found on the periodic table, is 28
Moles =

= 0.15mol
1mol = 6.023 x

atoms
So, 0.15mol = 0.15 x 6.023 x

= 9.0345 x

atoms
Answer:
b. is always a weak electrolyte.
Explanation:
Such compounds of low solubility dissociates partly and hence cannot be strong electrolytes
Answer:
pH of 7.86, then the [OH-] is equal to 10^(14-7.86) = 10^6.14 M
Explanation: