Light and Electrons
Ions and Isotopes
Lewis Dot
Periodic Families
Atomic and Periodic History
Periodic Trends
100
When atoms are heated to high temperatures, some electrons may absorb enough energy to "jump" to higher energy levels. The atom is then said to be in its.....
Excited state
100
The definition of "isotope"
At atom of the same element with a different mass / number of neutrons
100
Lewis dot diagram for Aluminum (Al)
100
The name of group 1 on the periodic table
Alkali metals
100
The scientist who discovered protons in his Gold Foil Experiment
Ernest Rutherford
100
The element with the larger atomic radius: Na or Ar?
Na
200
When wavelength increases, this happens to energy
Decreases
200
Name at least two variables that the average atomic mass depends
The number of isotopes of that element, the mass of each element, the abundance of each element
200
Lewis dot diagram for oxygen (O)
200
The group/family on the periodic table that is famously nonreactive
Noble gases (group 18)
200
Arranged the periodic table by atomic number, rather than by mass
Henry Moseley
200
As you go from top to bottom of a group, the atomic radius (increases, decreases, or stays the same)
Increases
300
The electron configuration for carbon (C)
1s22s22p2
300
Rubidium has two common isotopes, 85Rb and 87Rb.
85Rb 72.2% 85.0 amu
87Rb 27.8% 87.0 amu
What is the average atomic mass of Rubidium?
85.56 amu
300
Name of the periodic family/group that has seven (7) valence electrons
Halogens
300
As we increase the atomic number, this happens to the number of electrons
Also increases
300
First to demonstrate that atoms were mostly filled with empty space
Ernest Rutherford
300
The element with the higher electronegativity: Mg or Cl?
Cl
400
The energy of a photon of violet light with a frequency of 7.1 x 1014 Hz
4.7 x 10-19 J
400
Carbon-13 has how many protons, neutrons, and electrons?
6 protons, 7 neutrons, 6 electrons
400
The number of valence electrons found in an alkaline earth metal
Two (2)
400
A group that reacts violently with alkali metals
Halogens
400
First arranged the periodic table in order of increasing atomic mass
Dmitri Mendeleev
400
The element with the lower ionization energy: He or Fr?
Fr
500
A beam of light has a frequency of 7.26 x 1014 Hz; calculate its wavelength
4.13 x 10-7 m
500
Uranium has three common isotopes.
234U 0.01% 234amu
235U 0.71% 235amu
238U 99.28% 238amu
What is the average atomic mass of uranium?
237.98 amu
500
The only noble gas that does NOT have eight (8) valence electrons
Helium
500
These react violently with water
Alkali metals
500
J J Thomson discovered the...
Electron
500
The group on the periodic table with electronegativities of 0
The noble gases