Atomic...
What is the atomic number of an element represent?
# of protons
What is the electron configuration of Oxygen? (O)
1s22s22p4
What are the characteristics of non-metals?
bad conductors, brittle, some are gas some are solid, mostly full or totally full valence shell, gains electrons, anions,
Why can't atomic radii be directly measured?
Because the electron cloud surrounding the nucleus is not clearly defined.
How many blocks is the periodic table divided into and what are they called?
4 : s, p, d, f
What is the difference between mass number and atomic mass?
Mass number = #n + #p = whole number
atomic mass = average mass of all isotopes for that element = decimal number
What orbital is the final electron for Boron (B) in?
2p1
8
An atom becomes negatively charged when it what?
Gains more electrons than protons.
How did the Law of Octaves published by John Newlands arrange the elements?
atomic mass and that properties repeated every 8 elements
What is the atomic mass of Bromine (Br)?
79.904 amu
1s22s22p63s2
Magnesium (Mg)
Write the common electron configuration for any element in the halogen family.
s2p5
Put the elements in order of increasing atom size:
Cs, Rn, Hg
Cs, Hg, Rn
Left blank spaces for unknown elements of which he was able to predict their characteristics.
What is the atomic number of Sulfur (S)?
16
Which element does not have their final electron in the p6 orbital in Group 18? Why?
He
it only has 2 electrons!
What groups of families does the s-block contain?
Alkali metals and alkaline earth metals
Ionization energy is the energy required to remove an electron.
Put the following in order of decreasing ionization energy: Al, Ar, Na
Ar, Al, Na
What did Moseley do that changed the periodic table?
arranged elements by atomic number and
IF your atomic number is 25 and your mass number is 55, how many neutrons do you have?
30
Why does the f-block portion of the periodic table span 14 groups?
f subshell has 7 orbitals, and each orbital can hold 2 electrons, SO 7x2=14
What is the name of the d-block family and what is one characteristic of this family?
transition metals
Any characteristic consistent with metals! malleable, ductile, conductive, shiny
Why is F more electronegative than Ne?
Electronegativity is tendency of an element to attract electrons. Ne has a full valence shell, so does not attract any electrons, does not participate in bonding: has 0 electronegativity.
Name two metalloids.
B, Si, As, Ge, Sb, Te