Question

What element in period 4 has the lowest ionization energy? noble gas, alkali metal, halogen or alkaline earth metal?

Answer 1

Answer:

alkali metal

Explanation:

The alkali metals in period 4 will have the lowest ionization energy of the elements in the period.

Across a period ionization energy increases progressively from left to right due to decreasing atomic radii caused by the increasing nuclear charge which is not compensated for by successive electronic shells.

• Ionization energy is the energy needed to remove the most loosely bound electrons of an atom in the gas phase in the ground state.
• The measure of the readiness of an atom to lose an electron is the ionization energy.

Down a group, it decreases.

Answer 2

The periodic table is the arrangement of the elements based on the atomic numbers. The elements of the alkali period have the lowest ionization energy.

What is ionization energy?

Ionization energy or the potential is the amount of the potential needed by the molecule or the atom to remove the electron from their shells. The alkali metal elements have the lowest ionization energy.

The ionization potential of the elements increases from the left towards the right of the period due to the decrease in the atomic radii and decreases from top to bottom in a group.

In the period from left to right the atomic radius of the atoms decreases due to the increase in the nuclear charge of the atoms.

Therefore, option B. alkali metal has the lowest ionization energy.

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