The atomic number of the element Radium (Ra) is 88. It is an alkaline earth metal. Electronic configuration of Radium (Ra) will be ![[Rn]7s^{2}](https://tex.z-dn.net/?f=%5BRn%5D7s%5E%7B2%7D)
It belongs to the group IIA of the periodic table. Alkaline earth metals that belong to the group IIA of the periodic table lose the valence electrons to form a +2 ion.
Therefore, Radium with an electronic configuration of will lose the two 7s electrons to form the cation with +2 charge.
Molality
is one way of expressing concentration of a solute in a solution. It is expressed
as the mole of solute per kilogram of the solvent. To calculate for the
mass of the solute in a given solution, we need to calculate first for the number of moles of the substance by the product of the molality and the mass of the solvent. Then, we convert the number of moles into mass by using the molar mass. <span>
</span>
moles NaCl = 0.40 m (1.5 kg water) = 0.6 mol NaCl
mass NaCl = 0.6 mol NaCl ( 58.44 g / mol ) = 35.06 g NaCl
Therefore, the correct answer would be the third option.
4Ga(CN)3+3Sn(BrO3)4——-3Sn(CN)4+4Ga(BrO3)3
Good luck
An ion-dipole force is a type of intermolecular force in which forces of attraction or repulsion occur between neighboring ions, molecules or atoms.
