Question 16 Multiple Choice 20 points
In which pair are the elements most similar in their chemical properties?
Ca and Ba
S and P
Ag and Rb
Cs and Xe
Question 17 True/False 20 points
In Lewis dot structures, lone pairs are valence electrons not involved in covalent bonding.
Question 18 True/False 20 points
The Heisenberg uncertainty principle explains that the location and movement of an electron around a nucleus is better explained as a wave instead of a circular orbit.
Question 19 Multiple Choice 20 points
An exothermic reaction causes the surroundings to:
decrease its temperature
Question 20 Multiple Choice 20 points
Which element is considered a lanthanide?
To Question 16:
Ca and Ba are most similar because they are both elements of the same group ( Group 2, Earthalkaline metals )
To Question 17:
This sentence is true, because lone pairs are ...
Answers and a short explanation is given for the questions.
Short Answers for general chemistry, mainly related to atoms.
Question 6 True/False 20 points
The number of electrons in orbital 5f6 is 5 electons.
Question 7 Multiple Choice 20 points
Beginning at Argon, Ar, the electron configuration of a Copper atom (Cu) is:
Question 8 Multiple Choice 20 points
Beginning at Krypton, Kr, which element has the following electron configuration?
Question 9 True/False 20 points
One mol of Ga2O3 is equivalent to 433 grams.
Question 10 Multiple Choice 20 points
The 19th-century chemist credited with the modern arrangement of elements in the periodic table is: