the atomic number of Cd is 48
atomic number gives the number of protons in the atom
elements in their ground state, the number of protons is equal to the number of electrons
therefore number of electrons is 48
the condensed electronic configuration is [Kr} 4d¹⁰ 5s²
the outermost energy shell is the 5th energy shell with 2 electrons in the 5s subshell.
Valence electrons are the electrons in the outermost energy shell that are involved in chemical bonding.
there are 10 electrons in the 4d subshell however 4th energy shell is not the outermost energy shell therefore these electrons are not regarded as valence electrons
In Cd there are 2 electrons in the outermost energy shell therefore Cd has 2 valence electrons.
answer is 2
How to Tell Lewis Diagrams apart
Trigonal planar, Trigonal pyramid both have 3 things attached to them. Not 4. Tetrahedral is the only Lewis Diagram's center piece that has 4 things attached to it.
<em><u>Tetrahedral</u></em>: C with 4 Cl's attached.
<em><u>Trigonal Planar</u></em>: is flat. The element in the middle is generally a metal or an element from the Left side of the periodic table. There is never an isolated pair of electrons with Trigonal Planer shapes. Summary:
- The center element is a Metal on the left side of the periodic table.
- In your example, Boron is at the center of the drawing and it is in column 2 of the periodic table which makes it a metal.
- There are no isolated electron pairs
Trigonal Pyramid
- The two electrons are circled. These two are isolated and nothing is attacted to them.
- The central element is a non metal -- Nitrogen in this case.
- The non metal is on the RIGHT side of the periodic table
Bent
- Looks like it is in a straight line (but it is not).
- There are usually double bonds involved.
- The angle formed is usually greater than 90 degrees
- The central element is usually a non metal.
Problem One
Both parts of this question are correct.
Answer:
Starting at 1 to 2 months of age, the baby will receive vaccinations
Explanation:
have a wonderful day!