Answer:
Various limitations of Mendeleev's periodic table are:-
Position of hydrogen - he couldn't assign a correct position to hydrogen as it showed properties of both alkali and halogens .
Position of isotopes - he considered that the properties of elements are a function of their atomic masses. Hence isotopes of a same element couldn't be placed.
In the d-block , elements with lower atomic number were placed before higher atomic number.
Explanation:
Answer:
True
Explanation:
Because anything that has mass also has gravity
The answers is 3.0 g/cm^3
Explanation:
You use the formula
Density= mass/volume
When they give you mass and volume.
The mass is 15 grams and the volume would be 5 cm^3.
So the density would be
15/5= 3
Answer:
This element is Boron. The atomic number is 5
Explanation:
Answer : The molality of a solution is, 0.387 mol/kg
Explanation : Given,
Mass of solute (glycine) = 100.7 g
Mass of solvent (water) = 3.466 kg
Molar mass of glycine = 75.1 g/mole
Formula used :
Now put all the given values in this formula, we get:
Thus, the molality of a solution is, 0.387 mol/kg
