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Al has atomic number 13, and silicon has atomic number 14. The extra electron that silicon has is in a 3p orbital. In simple terms the extra charge on the silicon nucleus contracts the electron shell, this increases the energy to remove an electron and also decreases the atomic radius.

Al, first ionization energy 577.5 kJ/mol, atomic radius 125pm

Si, first ionization energy 786.3 kJ/mol, atomic radius 110pm

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Which element has a lower 1st ionization energy than aluminum?

The first level ionization energy oif aluminium is 577,5 kJ/mol.All alkali metals have lower values for the ionization energy.


Which of these elements has the highest first ionization energy Si or C?

Carbon (C) has a higher first ionization energy than silicon (Si). This is because as you move across a period in the periodic table, the first ionization energy generally increases due to increasing nuclear charge pulling electrons closer. Silicon is positioned to the right of carbon in the same period, resulting in a lower first ionization energy compared to carbon.


What are the ionisation enthalpies of potassium and sodium?

The first ionization energy of potassium is 419 kJ/mol, while the first ionization energy of sodium is 496 kJ/mol. This means that it requires less energy to remove an electron from a potassium atom compared to a sodium atom.


How does ionization energy affect the reactivity of metal?

Ionization energy is the energy required to remove an electron from an atom. A lower ionization energy means it is easier to remove electrons, making the metal more reactive. This is because metals with low ionization energy are more likely to lose electrons and form positive ions in chemical reactions.


Why ionisation energy of boron is lower than beryllium?

The ionization energy of boron is lower than beryllium because removing an electron from boron involves taking it out of the 2p orbital, which is higher in energy than the 1s orbital of beryllium. This makes it easier to remove an electron from the 2p orbital of boron, resulting in a lower ionization energy.

Related Questions

What is ionisation energy What is first ionisation energy?

The first ionization energy of an atom or molecule describes the amount of energy required to remove an electron from the atom or molecule in the gaseous state.


Is Aluminum low ionization energy?

The ionization energy of aluminium is 5,985 77 eV. It is a medium energy.


What is the energy needed to remove electrons from an atom called?

ionization potential energy. but remember the atom must be neutral .


Why are the ionisation energy of isotopes the same?

The ionization energy of isotopes is the same because isotopes have the same number of protons in their nucleus, which determines the ionization energy. Isotopes differ in the number of neutrons they possess, but neutrons do not contribute significantly to the ionization energy compared to protons.


What is the relationship between ionization energy and the alkali metals?

There is no relation ship. They have the lowest ionization energies.


What element has the Highest ionization energy in Group 14?

ionisation energy order for gr 14 is c>si>ge>sn<pb


What has a second ionization energy level of 1577?

The element that has the highest second ionization energy is Li. When you remove the first electron from Li you are down to the 1s orbital. They are harder to remove because they are closest to the nucleus.


Has the highest ionization energy in the group element?

ionisation energy order for gr 14 is c>si>ge>sn<pb


Ionisation energy of noble gases?

Noble gases have high ionization energies due to their stable electron configurations and full outer electron shells. This makes it difficult to remove an electron from them compared to other elements. The ionization energy generally increases from helium to radon within the noble gas group due to increasing nuclear charge.


Which element has a lower 1st ionization energy than aluminum?

The first level ionization energy oif aluminium is 577,5 kJ/mol.All alkali metals have lower values for the ionization energy.


Is the ionization energy of alkali metals larger or smaller than the alkaline earth metals in the same period?

It is about first ionization energy. It is less than alkaline earth metals.


Which of these elements has the highest first ionization energy Si or C?

Carbon (C) has a higher first ionization energy than silicon (Si). This is because as you move across a period in the periodic table, the first ionization energy generally increases due to increasing nuclear charge pulling electrons closer. Silicon is positioned to the right of carbon in the same period, resulting in a lower first ionization energy compared to carbon.