Question

The number of species having higher first ionization energy than Ca from the following is Ga, Ge, Br,Se, Kr, As, K.​

Answer 1

Answer:

6

Explanation:

As we go across a period.. Ionisation Energy increases.. Refer Periodic Table..

Ga, Ge, Br, Se, Jr, As have higher Ionisation Energies than Ca..

Hope this helps...

Bhuvan..

Answer 2

Six elements have higher first ionization enthalpy in the given elements.

• The minimum amount of energy required to remove an electron from an isolated atom or molecule is defined as ionization energy.

• As we go down the group, the values of ionization energy decrease gradually. ( Some exceptions in some groups ).

• As we go across the period, the value of ionization energy increases gradually. ( With some exceptions ).

• The elements of the 18th group have higher ionization energies compared to the other groups.

• The elements K, Ca, Ga, Ge, As, Se, Br, K belongs to the same period The order of  their atomic numbers are:

=> K = 19, Ca = 20, Ga = 31, Ge = 32, As = 33, Se = 34, Br = 35, Kr = 36.

=> As the elements belong to the same period, the value of ionization enthalpy increases from left to right.

=> Order of I.E = K < Ca < Ga < Ge < As < Se < Br < Kr.

=> 6 elements have higher Ionization enthalpy than Ca.

Therefore, 6 elements have higher Ionization enthalpy than Ca.