Answer:
Chlorine(Cl)
Explanation:
Because the shielding effect(by the inner electrons) remains the same but the nuclear charge is increasing(due to the increasing number of protons)
So Chlorine has the highest number of protons...so its outter electrons tend to expierence the most nuclear attraction hence making it more harder to remove the first electron
Answer:
170 g
Explanation:
Moles of Oxygen gas :
Given, Mass of Oxygen = 80.0 g
Molar mass of Oxygen gas= 31.998 g/mol
The formula for the calculation of moles is shown below:
Thus,
The reaction between Al and O₂ is shown below as:
4Al + 3O₂ ⇒ 2Al₂O₃
From the reaction,
3 moles of O₂ on reaction forms 2 moles of Al₂O₃
1 mole of O₂ on reaction forms 2/3 moles of Al₂O₃
2.5 moles of O₂ on reaction forms (2/3)*2.5 moles of Al₂O₃
Moles of Al₂O₃ = 1.6667 moles
Molar mass of Al₂O₃ = 102 g/mol
Mass = Moles * Molar mass = 1.6667 * 102 g = 170 g
As atomic number increases atomic radii also increase down group 1. ionisation energy down group 1 will also decrease because as atomic radii gets bigger there is less electrostatic force between nuclei and electrons so less energy needed to remove valence electron.
Conservation of mass and every means it should be equal on both sides. So there should be another 2 Cl on the other side of the reaction
3H2 + 3Cl2 —> 6HCl
As long as we have 3 in front of the compound so u have to multiple it by the number of the elements that are in the compound
We have 6 H
And 6Cl
So we need 6 HCl to balance the equation.
Hope that it helps
