Mike would be right, since there are only 3 electrons in the shell, if shows that there are 3 protons. Lithium is the only element with 3 protons
Answer:
last one
Explanation:
The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium, and polonium.
Answer:
15.9 mol/kg is the molality for the solution
Explanation:
36.71% means that 36.71 g of solute are contained in 100g of solution
36.71 g → mass of solute
100 g → mass of solution (mass of solute + mass of solvent)
Mass of solvent → 100 g - 36.71 g = 63.29 g
Molality → moles of solute in 1kg of solent
We convert the mass of solute to mol → 36.71 g . 1mol/36.45 g =1.007 mol
We convert the mass of solvent from g to kg → 63.29 g . 1kg/1000g = 0.06329 kg
1.007 mol /0.06329 kg → molality → 15.9 m
Answer:
<h3>
Explanation:</h3>
In Analytical Chemistry chromatography is widely used for the separation of samples.
- In thin layer chromatography, the mixture of components are separated on the basis of their polarity.
- The solvent solution(mobile phase) that we use are non polar & silica gel( TLC paper made of/stationary phase) are polar.
- Consider the mixture we have taken consist of two samples having large polar difference.
- Due to opposite nature of silica gel(polar) & solvent solution (non polar) the movement become easy & due to capillary action solvent solution rise to the top.
- The mixture of sample we have taken, the sample have less polarity have high peak or they travel more distance than that of more polar sample when they dipped into the solution.
In the given diagram, mixture of 8 samples are separated on the basis of their polarity, the distance travelled by solvent is 35 mm, distance travelled by sample 1 is 11 mm & similarly distance travelled by sample 2,3,4,5,6,7 are 15,31,4,22,25,33 in mm respectively.
Rf Value: Rf value is retention factor which tells about relative absorption of each sample & range of Rf value is 0-1.
Formula to calculate Rf value is
Now, solving for Rf value of sample 1
<em>Given:</em>
Distance moved by sample 1 = 11 mm
Distance movedby solvent = 35 mm
<em>To find:</em>
Rf value of sample 1 = ?
<em>Solution:</em>
Substituting the given data in above formula,
<em><u>Thanks for joining brainly community!</u></em>
I tried to answer this but forgot answer gg