Configurations
What is the electron configuration for the alkaline earth metal in period 4?
[Ar]4s2
How does ionization energy change as you move down a group?
Which of the following atoms would have a smaller atomic radius: Ca, As, or Br?
Br
How did Mendeleev organize his periodic table?
Increasing atomic mass and elements with similar properties were in the same group
Do atoms on the left side of the periodic table tend to gain or lose electrons?
lose
Determine the number of valence electrons of the element in the following configuration: [Ne]3s23p2
4
How does atomic radius change as you move across a period from left to right?
Generally decreases
Which of the following atoms has the largest atomic radius: C, O, or Al?
Al
How is the periodic table organized today?
Increasing atomic number and elements with similar properties are in the same group
Which block are the transition metals in?
d-block
Determine the period and group of the element in the following configuration: [Ar]4s23d104p5
group: 7A
period: 4
Decreases
Which of the following atoms has a greater electronegativity: Ge or Cl?
Cl
What do you call the elements in group 7A?
Halogens
Why did Mendel leave spaces in his periodic table?
He predicted the properties of elements that had not yet been discovered
What is the electron configuration for the metalloid in group 3A?
[He]2s23p1
An atom on the right side of the periodic table becomes an ion: did it gain or lose electrons?
gain
Which of the following atoms has the lowest ionization energy: K, Na, or Li?
K
Why are the noble gases so stable?
They have a full valence shell / outer energy level
alkali metals
Determine how many valence electrons are in the element with the following configuration: [Kr]5s23d105p1
Why does atomic radius increase as you move down a group?
Energy levels are being added and electrons are farther from the nucleus
If you plot atomic number vs. atomic trend, which value should go on the x-axis and which value should go on the y-axis?
atomic number on x-axis
trend on y-axis
Which scientist noticed that elements repeated properties every eighth element when organized by atomic mass?
Newlands
What are two properties of nonmetals and two properties of metals?
non: gases or brittle solids, poor conductors, dull
metals: shiny, ductile, malleable, good conductors