Lithium is in the Alkali Metal group or 1A column. The atoms in this group form ions with a 1+ charge. Lithium ion’s charge is 1+.
Electrostatic, meaning the attraction from one's positive nucleus is to the negative electrons of the other atom and vis versa.
Explanation:
option option B is the correct answer of given statement helium-4(He)=2
The answer is 0.25 M
Use the equation C1V1=C2V2
(.5)(100)=x(200)
x=0.25