Question

Select the element in each pair with the higher ionization energy.
a. Br or I
b. Mg or Sr
c. Si or P
d. I or Xe

Short answer

Part(a) Br have the higher ionization energy.

Part(b) Mg have the higher ionization energy.

Part(c) P have the higher ionization energy.

Part(d) Xe have the higher ionization energy.

Step-by-step solution

Part(a) Step 1 : Given information

We are given Br or I elements. We have to find element with higher ionization energy.

Part(a) Step 2 : Simplify  

As we know in Periodic table from left to right the ionization, no energy decreases or increases due to the increase in nuclear charge. And from bottom to top, also, the ionization energy increases as the electrons are closer to the nuclear charge in the nucleus.

Therefore, Br have higher ionization energy than I.

Part(b) Step 1 : Given information

We are given Mg or Sr elements. We have to find element with higher ionization energy.

Part(b) Step 2 : Simplify  

As we know in Periodic table from left to right the ionization, no energy decreases or increases due to the increase in nuclear charge. And from bottom to top, also, the ionization energy increases as the electrons are closer to the nuclear charge in the nucleus.

Therefore, Mg have higher ionization energy than Sr.

Part(c) Step 1 : Given information

We are given Si or P elements. We have to find element with higher ionization energy.

Part(c) Step 2 : Simplify  

As we know in Periodic table from left to right the ionization, no energy decreases or increases due to the increase in nuclear charge. And from bottom to top, also, the ionization energy increases as the electrons are closer to the nuclear charge in the nucleus.

Therefore, P have higher ionization energy than Si.

Part(d) Step 1 : Given information

We are given I or Xe elements. We have to find element with higher ionization energy.

Part(d) Step 2 : Simplify  

As we know in Periodic table from left to right the ionization, no energy decreases or increases due to the increase in nuclear charge. And from bottom to top, also, the ionization energy increases as the electrons are closer to the nuclear charge in the nucleus.

Therefore, Xe have higher ionization energy than I.