Answer:
The density of gallium would be greater than aluminium and boron.
Explanation:
Density:
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
Symbol:
The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.
As we move down the group densities increases because larger increase in mass occur with increase ion volume and greater sizes of elements down the group.
The boron, aluminium and gallium present in group thirteen. Boron is present in period two aluminium is present in period three and gallium is present in period four. So, atomic number of gallium is greater than boron and aluminium and it is appear as we move down the group. that's why gallium has larger size and greater value of density then boron and aluminium.
The value of density of gallium is 5.904 g/cm³.
E and B
Explanation:
The last option violates Aufbau's principle.
Aufbau's principle states that "the sublevels with lower energies are filled up before those with higher energies."
This implies that orbitals are not filled based on numerical order but on their energy levels.
The order is as follows;
1s 2s 2p 3s 3p 4s 3d e.t.c
In B, the 3s was not filled before jumping to 3p
In E, 3p was not filled before jumping to 3d and 3d was not even the next orbital.
learn more:
Atomic orbital brainly.com/question/1832385
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Answer:
The true statement is a. Reductants reduce oxidants and become oxidized.
Explanation:
The principle characteristic of reductant is to donate electron and that donated electron is accepted by an oxidant.
As a result reductant become oxidized by reducing the oxidant which itself get reduced by accepting the electron from the reductant.
Answer:
a)The mass percentages of nitrogen and phosphorus in the compound is 24.34% and 26.95% respectively.
b) 14.78 grams ammonia is incorporated into 100. g of compound.
Explanation:
a) Ammonium dihydrogen phosphate that is 
.
Molecular mass of ammonium dihydrogen phosphate = M
M = 115 g/mol
Percentage of an element in a compound:
Percentage of nitrogen:
Percentage of phosphorus:
b) Percentage of ammonia in 1 molecule of ammonium dihydrogen phosphate.
Molar mass of ammonia = 17 g/mol
Amount of ammonia in 100 grams of compound:
14.78% of 100 g of ammonium dihydrogen phosphate:
14.78 grams ammonia is incorporated into 100. g of compound.
