Number one is true !!!!!!????!???????????!!!!!!!!!!!!
Answer:
A = shielding.
Explanation:
The addition of electron causes the atomic size increase from top to bottom due to increase in atomic number.
As the atomic number increased one more electron is added and because of this electron on more electronic shell is added. Thus the electron become more away from the nucleus as many of other electrons are present in the way from nucleus to the outer electrons.
The hold of nucleus becomes weaker. Although nuclear charge is also increased but at the same time other electrons shield the respective electrons. So effective nuclear charge is weaker than the actual nuclear charge.
Because of this shielding it is easy to remove the electrons or we can say ionization energy decreases.
<span>It was a heterogeneous mixture.
Since you were able to separate the mixture than means they are heterogeneous mixture </span>
If we remove 2 electrons, the new charge will be positive by 2 units. Hence, the ion is
.
