Question

1. the ionization energies for element x are listed in the table above. on the basis of the data, element x is most likely to be (a) na (b) mg (c) al (d) si (e) p
2. given: ionization energies of a hypothetical element (kj/mol)

the ionization energies for element x are listed in the table below. on the basis of the data, element x is most likely to be
first 675 second 135 third 12,459 fourth 15,078
what group does the hypothetical element belong?
a. 1a
b. 2a
c. 3a
ionization energy

Explanation:

Step1: Analyze ionization - energy trends

Elements in the same group have characteristic ionization - energy patterns. A large jump in ionization energy occurs when removing an electron from a core shell.

Step2: Examine the first problem

For the first set of ionization energies of element X (580, 1815, 2740, 11600, 14800 kJ/mol), there is a large jump between the third and fourth ionization energies. This indicates that the element has 3 valence electrons. Aluminum (Al) has 3 valence electrons. Comparing with the provided data for different elements, the values match those of Al.

Step3: Examine the second problem

For the hypothetical element with ionization energies (675, 135, 12459, 15078 kJ/mol), there is a large jump between the second and third ionization energies. This implies that the element has 2 valence electrons. Elements in group 2A have 2 valence electrons.

Answer:

1. C. Al
2. b. 2A