Arrange the following elements from highest to lowest ionization energy:
a) Be, Mg, Ca, Rb, Y
b) Be, Mg, Ca, Rb, Sr
c) Rb, Sr, Ca, Be, Mg
d) Rb, Sr, Ca, Mg, Be
e) Be, Mg, Ca, Sr, Rb
The order of elements from highest to lowest ionization energy is as follows:
a) Be, Mg, Ca, Rb, Y
b) Be, Mg, Ca, Rb, Sr
c) Rb, Sr, Ca, Be, Mg
d) Rb, Sr, Ca, Mg, Be
e) Be, Mg, Ca, Sr, Rb
To arrange the elements from highest to lowest ionization energy, we need to consider the general trend of ionization energy across the periodic table. Generally, ionization energy increases from left to right across a period and decreases from top to bottom within a group.
Let's go through the options:
a) Be, Mg, Ca, Rb, Y
The atomic number of the elements in this option is:
Be (4) < Mg (12) < Ca (20) < Rb (37) < Y (39)
Based on this, the correct order from highest to lowest ionization energy would be: Y, Rb, Ca, Mg, Be. However, this does not match any of the given options.
b) Be, Mg, Ca, Rb, Sr
The atomic number of the elements in this option is:
Be (4) < Mg (12) < Ca (20) < Rb (37) < Sr (38)
Based on this, the correct order from highest to lowest ionization energy would be: Sr, Rb, Ca, Mg, Be. This matches option "b).
c) Rb, Sr, Ca, Be, Mg
The atomic number of the elements in this option is:
Rb (37) < Sr (38) < Ca (20) < Be (4) < Mg (12)
Based on this, the correct order from highest to lowest ionization energy would be: Rb, Sr, Ca, Mg, Be. This does not match any of the given options.
d) Rb, Sr, Ca, Mg, Be
The atomic number of the elements in this option is:
Rb (37) < Sr (38) < Ca (20) < Mg (12) < Be (4)
Based on this, the correct order from highest to lowest ionization energy would be: Rb, Sr, Ca, Mg, Be. This matches option "d).
e) Be, Mg, Ca, Sr, Rb
The atomic number of the elements in this option is:
Be (4) < Mg (12) < Ca (20) < Sr (38) < Rb (37)
Based on this, the correct order from highest to lowest ionization energy would be: Sr, Rb, Ca, Mg, Be. This does not match any of the given options.
Therefore, the correct answer is option "b) Be, Mg, Ca, Rb, Sr".
To arrange the elements from highest to lowest ionization energy, we need to understand the periodic trend of ionization energy across the periodic table.
Ionization energy is the energy required to remove an electron from an atom or ion. It generally increases from left to right across a period and decreases from top to bottom in a group.
Let's analyze the given options:
a) Be, Mg, Ca, Rb, Y
To arrange these elements, we need to consider their positions in the periodic table. Be, Mg, and Ca are in the same period, while Rb and Y are in different periods.
Looking at the period from left to right, the ionization energy increases. So, the correct order is:
Be < Mg < Ca < Rb < Y
b) Be, Mg, Ca, Rb, Sr
Similarly, let's arrange these elements. Be, Mg, and Ca are in the same period, while Rb and Sr are in different periods.
The correct order based on the trend is:
Be < Mg < Ca < Rb < Sr
c) Rb, Sr, Ca, Be, Mg
Now, let's consider these elements. Rb and Sr are in the same period, while Ca, Be, and Mg are in different periods.
The correct order based on the trend is:
Rb < Sr < Ca < Be < Mg
d) Rb, Sr, Ca, Mg, Be
Ordering these elements according to their positions in the periodic table, we get:
Rb < Sr < Ca < Mg < Be
e) Be, Mg, Ca, Sr, Rb
Finally, let's arrange these elements. They are already listed in decreasing atomic number order.
So, the correct order is:
Rb < Sr < Ca < Mg < Be
To summarize the order of the elements from highest to lowest ionization energy:
a) Be, Mg, Ca, Rb, Y: Be < Mg < Ca < Rb < Y
b) Be, Mg, Ca, Rb, Sr: Be < Mg < Ca < Rb < Sr
c) Rb, Sr, Ca, Be, Mg: Rb < Sr < Ca < Be < Mg
d) Rb, Sr, Ca, Mg, Be: Rb < Sr < Ca < Mg < Be
e) Be, Mg, Ca, Sr, Rb: Rb < Sr < Ca < Mg < Be