Math
What is the basic form of a number in scientific notation?
One digit, decimal, other digits, x 10 ^ power
Who maintained the false theory about earth, air, fire, water?
Aristotle, and many people for thousands of years.
First understanding of an electron (At rutherford/chadwick model)
Negative particles spinning aimlessly around a nucleus.
What is the level and sub-level of the last electrons in Selenium?
4p
How are atoms organized on the periodic table?
atomic number, (chemical properties)
How many significant figures in 23,020?
4
what was the first definition of an atom?
Smallest particle of an element, indivisible
Who brought electrons into circles, a planetary model?
Bohr
What is the electron configuration of Germanium (noble gas configuration is fine)
[Ar]4s23d104p2
What are the atoms in group 17 called?
Halogens
Why are significant figures, significant?
They tell us how precise a measurement is, help with rounding answers.
How was positive nucleus discovered?
What was Bohr trying to explain?
Light emission spectra from elements. Only certain quanta, wavelengths of light were being emitted. So there must be certain levels to jump from.
What is the sublevel number for d orbitals?
2
Where would you find elements that react similarly? Why would they react similarly?
Groups, same number of valence electrons
When dividing numbers in scientific notation, what do you do?
Divide the beginning numbers.
For the exponents, subtract the bottom from the top.
Change number back into scientific notation if the first number now is not.
(Or change into standard notation if the exponent is near zero.)
Who discovered each particle?
Thomson/Millikan - electron
Rutherford - positive nucleus
Chadwick - neutron
What did Einstein and then Debroglie assert about dual nature?
Light is both particle and wave, electron is both particle and wave.
How many orbitals are in sublevel f?
7
What does electronegativity mean? Where are the most electronegative atoms?
The strength of an atoms attraction to electrons of other atoms. Top right (not including noble gases)
What is the right answer with significant figures for 223.4 + 3.452?
226.9 (226.852 rounded to one decimal)
charge and mass of electrons
Which atom was first examined to explain energy levels?
Hydrogen
What are the four sublevels?
What are the numbers of the last electron in Barium?
n, l, ml, ms
6, 0, 0, -1/2
What is the number with a decimal written under the atomic symbol. Why is it a decimal?
Atomic mass number, because it is an average of all isotopes of an element.