Which of the following is true regarding the inner transition elements? A. These include all elements in groups 3–12. B. They oc
2 answers:
Answer:
D. Their valence electrons can be in both s and f sublevels.
Explanation:
The inner transition elements are those in the two long rows at the bottom of the Periodic Table.
The <em>lanthanide series </em>starts after Ba in Period 6, and the <em>actinide series</em> starts after Ra in Period 7.
Thus, we would predict their electron configurations to be of the form
However, the energy levels of the <em>n</em>s, (<em>n</em>-1)d, and (<em>n</em>-2)f orbitals are so close in energy that there are many exceptions to our predictions
For example, here are some electron configurations.
La = [Xe]6s²5d (not [Xe]6s²4f)
Ce = [Xe]6s²4f5d (not [Xe]6s²4f²)
Pr = [Xe]6s²4f³ (as predicted)
Thus, their valence electrons can be in both s and f (and sometimes d) sublevels.
A. <em>Wrong</em>. The inner transition elements do not include the elements in Groups 3 to 12. They are the elements between Groups 2 and 3.
B. <em>Wrong.</em> They do not occupy the d block (those are the transition metals). They occupy the f block.
C. <em>Wrong</em>. They include the lanthanides and actinides, but most of them have at least one electron in an f sublevel.
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Answer:
Q = 1455.12 Joules.
Explanation:
Given the following data;
Mass = 300 grams
Initial temperature = 22.3
Final temperature = 59.9°C
Specific heat capacity = 0.129 J/gºC.
To find the quantity of energy;
Where,
Q represents the heat capacity.
m represents the mass of an object.
c represents the specific heat capacity of water.
dt represents the change in temperature.
dt represents the change in temperature.
dt = T2 - T1
dt = 59.9 - 22.3
dt = 37.6°C
Substituting the values into the equation, we have;
Q = 1455.12 Joules.
Explanation:
there you go you can just look up atomic model for CD and click images
Answer:
A) increasing dispersion interactions
Explanation:
Polarizability allows gases containing atoms or nonpolar molecules (for example, to condense. In these gases, the most important kind of interaction produces <em>dispersion forces</em>, <em>attractive forces that arise as a result of temporary dipoles induced in atoms or molecules.</em>
<em>Dispersion forces</em>, which are also called <em>London forces</em>, usually <u>increase with molar mass because molecules with larger molar mass tend to have more electrons</u>, and <u>dispersion forces increase in strength with the number of electrons</u>. Furthermore, larger molar mass often means a bigger atom whose electron distribution is more easily disturbed because the outer electrons are less tightly held by the nuclei.
Because the noble gases are all nonpolar molecules, <u>the only attractive intermolecular forces present are the dispersion forces</u>.
