Periodic Table
What group is column 8?
Noble Gases
Cations are ___________ charged ions.
Positively
Isotopes have the same ____ but different ___.
atomic number (number of protons), mass number (number of protons + neutrons)
What is average atomic mass?
The atomic mass for each element appearing on the periodic table represents the weighted average of masses for each individual isotope of an element
How many elements have been discovered?
118
Name an element in group 18.
What is (group 18 element)?
Elements in group 2A for ions with this charge.
2+
Complete the following:
Isotope name: Oxygen-17
atomic#___ mass#____ #of protons ____ #of neutrons_____ #of electrons_____
Atomic #: 8
Mass #: 17
# of Protons: 8
# of Neutrons: 9
# of Electrons: 8
An element with 5 protons, 6 neutrons, and 8 electrons has a mass number of ___.
11
This element was discovered in the sun's spectrum before it was found on Earth.
What is helium?
What are the 3 parts of an atom?
Protons, electrons, and neutrons
The charge would an atom would have with 10 neutrons, 7 electrons, and 11 protons.
What is -3?
Arsenic isotope is written as As-85 with 33 protons, how many neutrons does it have?
52 neutrons
The mass of the most common isotope of an element is known by looking at the periodic table based on an element's ____.
Average atomic mass.
How do you calculate the average atomic mass of an isotope?
Multiply the mass of each isotope by its percent abundance then divide by 100
A.) This element is in the same family as Br, but has fewer protons than Mg. It must be ____.
B.) This element has 6 energy levels and 8 valence electrons. It must be ____.
A.) F (Fluorine)
B.) Rn (Radon)
Chlorine would most likely make this charge to be happy.
What is -1?
What the difference between an element, ion and isotope?
Element- different number of protons
Ion- different number of electrons
Isotope- different number of neutrons
If Boron-10 with an abundance of 19.78% 10.013 amu and Boron-11 with an abundance of 80.22% 11.009 what is the average atomic mass?
10.81 amu
This scientist was a passionate soccer fan and played for his university team.
What is Niels Bohr?
A.) This element is in the alkaline earth metals group and has 3 energy levels. This must be____.
B.) This element is in the family with the most reactive non metals and has 4 energy levels. It must be____.
A.) Mg (Magnesium)
B.) Br (Boron)
Explain the difference between a cation and an anion and how can you determine the change of an ion based on its position on the periodic table?
A cation is a positive and anion is negative. Metals tend to form cations and non metals form anions.
Solve the following:
Uranium-238
Atomic #:
Mass #:
# of Protons:
# of Neutrons:
# of Electrons:
Atomic #: 92
Mass #: 238
# of Protons: 92
# of Neutrons: 146
# of Electrons: 92
If Sulfer-32 93.12% 31.928 amu and Sulfer-34 6.88% 34.023 what will the average atomic mass?
32.07 amu
This is one of the elements that Mendeleev pre-discovered.
What is gallium or germanium?