How many ELECTRONS can the first ring/orbital shell hold?
The first ring/orbital shell can hold a maximum of 2 ELECTRONS
How many significant figures are in the answer to 53543.2 + 239.2833
53782.5, 6 sig figs
On a periodic table, what do periods represent
Each period indicates how many rings/shells an atom has.
Each time you go down a period, an atom gains a what
An energy level
True or False: There are elements that have two uppercase letters as the element symbol?
False
What is the number of Neutrons located in this element? Round if necessary.

12 neutrons.
How many liters of O2 will have the same number of molecules as 3L of CO2
3L
How is the table organized?
By the atomic number/ number of protons
What is the family of elements called that are located in group 17?
Halogens
What classification of elements on the periodic table has the most elements in it?
metals
What is the horizontal (left to right) rows on the periodic table called?
period
What are the 3 main classifications of elements?
metals, non-metals, and metalloids
What is the name of MnP
Manganese (III) Phosphorous
What is ionization energy and which group has the lowest?
The energy required to remove an electron from an atom
Group 1
Which group has elements with no electronegativity
Noble Gases, Col. 18
What is the name of the elements in groups 3-12
Transition metals
What are the vertical (up and down) columns on the periodic table called?
Groups/Families
What groups have all 3 types of elements in them?
14, 15, 16
What is entropy? Give an example of water having a change in entropy
Entropy is the disorder in a system, water freezing would be a decrease in entropy. Water evaporating would be an increase in entropy.
How does atomic radius change going across a group? Why does it change that way?
It decreases due to nuclear attraction
How does electronegativity change going down a period? Why does it behave this way?
Metals can be malleable. What does this mean?
Can form shapes, easy to bend such as aluminum (Al) frame on the class chairs or aluminum foil, braces
What is the name of group 1 elements? Give a characteristic of them
Alkali metals and they are extremely reactive
Similar Chemical Properties determine which _______ an element is located in.
Group
How many liters of gas is in 53.9 grams of NH3?
71.02 L
Which group or family has members like Li, Rb, K, and Fr?
Alkali Metals
What 2 elements on the periodic table are liquid at STP?
bromine and mercury
How does atomic radius change going down the group? Why does it behave this way?
It increases due to more electron shells/energy levels
How does electronegativity change going down a group? Why does it behave that way? (must use official term)
It decreases due to electron shielding