atomic history
Who developed the first periodic table?
Mendeleev
What is the name of columns 3-12?
transition metals
What particles are negative in an atomic structure?
electrons
An atom or molecule with a charge due to a loss of electron is called a ?
ion
How many electrons are in the second ring of a Nitrogen electron cloud?
8
Who rearranged the periodic table by atomic number?
henry moseley
Name these groups. Group 1 and group 2
alkali metals and alkaline earth metals
What has the number as the atomic number?
protons
Two or more of the same element that contain equal numbers forms is called?
isotope
What are the electron orbital filling rules?
aufbau principle- lowermost, Hund's rule- one sub level, Pauli exclusion- paired
Whos used a cathode ray to discover electrons?
JJ Thompson
What do the elements in each period have in common?
All of the elements in a period have the same number of atomic orbitals
The smallest particle of an element that retains all of the properties of that element is called _______.
an atom
Naturally occurring chlorine that is put in pools is 75.53% 35Cl (mass=34.969 amu) and 24.47% 37Cl (mass= 36.966 amu). Calculate the average atomic mass.
35.46 amu
What is the electron configuration of Calcium?
1s2 2s2 2p6 3s2 3p6 4s2
Who named the atom
John Dalton
Are elements in group 17 covalent or Ionic
covalent
How many electrons are in the first level of a nitrogen atom
4
Silicon has 3 isotopes with the following % abundances Si-28, 92.38% Si-29, 4.67% Si-30, 3.10%
28.11
What is the electron configuration for P
1S2 2S22P63S23P
who's model is named ¨plum Pudding¨
JJ Thompson
What is the name of columns 3-12?
transition metals
What has the same number on some occasions
electrons
How many neutrons are in an atom of Carbon - 14
8
How many electrons are in the first ring of a hydrogen electron cloud?
2