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Electrons
Trends
History
Calculations
The Periodic Table!
100
How many valence and total electrons does a neutral atom of Nitrogen have?
5 valence electrons and 7 total electrons
100
Which trend increases from right to left and from top to bottom on the periodic table?
Atomic Radius
100
What three subatomic particles make up the atom and what are their charges?
Protons (positive), neutrons (neutral) and electrons (negative)
100
What is the speed of light, c, if the frequency of a wave is 1.5E6 Hz and its wavelength is 200 m?
3.0E8 m/s
100
How many protons does scandium have?
21
200
What is the electron configuration of Aluminum?
1s2 2s2 2p6 3s2 3p1
200
Which two trends increase from left to right and from bottom to top?
Ionization Energy and Electronegativity
200
Who came up with the idea that atoms have orbitals?
Niels Bohr!
200
How much energy does a photon carry if it vibrates at a frequency of 5E12 Hz?
3.32E-21 J
200
What does the mass number tell us about an atom?
The number of protons and neutrons that atom has
300
How many dots go around the Lewis dot structure of Be?
2
300
Rank the following elements in order of increasing electronegativity: Si, Cl, Ge
Ge, Si, Cl
300
Where is most of the mass of an atom found?
In the nucleus!!
300
How much energy does a photon carry if its wavelength is 20 m?
9.95E-27 J
300
What is the name of an atom that has the same number of protons but a different number of neutrons compared to another atom?
An isotope
400
Compared to alkaline earth metals, how many more valence electrons do halogens have?
5
400
Which of the following two pairs of atoms has the larger atomic radius? F vs F- and Ca and Ca2+
F- and Ca
400
What did Thomson prove about the atom?
That it can be divided into positive and negative parts (protons and electrons).
400
An isotope of an unknown element has two forms. Isotope A has a mass of 35 amu and is 54.7% abundant and isotope B has a mass of 36 amu and is 45.3% abundant. What is the the average atomic mass of the unknown element and what is this element's identity?
35.453 amu and it is Chlorine!
400
A neutral atom must have the same number of ___________ and _____________ to remain neutral?
Protons and electrons
500
Rank the following elements in order of decreasing valence electrons: Al, Kr, Cs, Zn
Kr, Al, Zn, Cs
500
Rank the following elements in order of increasing radius: Cl, S2-, S
Cl, S, S2-
500
How were Rutherford's and Thomson's model of the atom different?
Thomson had the plum pudding model with free-flowing electrons in a positive pudding; Rutherford showed that the positive charge occupies a small space
500
The total energy needed to poke a hole through a brick wall is 3000 J. An element's electron vibrates at a frequency of 5E36 Hz. Using h = 6.63E-34, how much energy does this electron have and is it enough to poke a hole through a brick wall?
3315 J and yes, it is!!
500
Sulfur gained two electrons and now has the same number of electrons as which neutral element? What is the family name for this group on the periodic table?
Argon and it is a noble gas!