Periodic Trends
Bigger atomic radius: Fe or Ru?
Ru
What is an isotope
2 atoms with same number of protons, different number of neutrons, different mass
1s22s22p5
Fluorine
Isoptope 1: mass = 12, 98.90%
Isotope 2: mass = 13.003355, 1.10%
12.011
The row on the periodic table
period
Smaller electronegativity: Nb or Co?
Nb
Are these isotopes?
Atom Protons Neutrons Electrons
1 7 7 10
2 7 7 7
no, they are ions
[Rn]7s26d15f3
Uranium
Isoptope 1: mass = 14.003074, 99.63%
Isotope 2: mass = 15.000108, 0.37%
14.007
the column on the periodic table
group
Smaller ionization energy: Nb or Co?
Nb
Which ones are isotopes of each other?
Atom Protons Mass Electrons
1 8 16 8
2 8 17 10
3 9 16 8
1 and 2
extended electron configuration for argon
1s22s22p63s23p6
In a sample of 400 lithium atoms, it is found that 30 atoms are lithium-6 (6.015 amu) and 370 atoms are lithium-7 (7.016 amu). Calculate the average atomic mass of lithium.
6.94 amu
located in the d-block
transition metals
bigger ionic radius: K+ or Br-
Br-
An atom has 29 protons and 37 neutrons. What is the correct chemical symbol?
6629Cu
full electron configuration for Nd
1s22s22p63s23p64s23d104p65s24d105p66s25d14f3
Copper occurs naturally as Cu-63 and Cu-65. Which isotope is more abundant?
Cu-63
Block that gases are located in?
p block
Smaller ionic radius: Li+1 or B+3
B+3
Do neutrons determine the element we are looking at? Why or why not?
No, they do nothing but change the mass.
Valid or not: [Ra]7s26d25f3
no
Copper has two naturally occuring isotopes. Cu-63 has an atomic mass of 62.9296 amu and an abundance of 69.15%. What is the atomic mass of the second isotope? What is its atomic symbol?
6529Cu
This corresponds to the energy levels
period number