History
The person given credit for making the first periodic table of elements is
Dmitri Mendeleev
The elements in the modern periodic table are arranged by what?
Atomic Number
How do you become an ion?
Positive ion - lose electrons
Negative ion - gain electrons
The positively charged nucleus pulling electrons inward is called
nuclear charge
The Periodic Table
How did Mendeleev arrange his periodic table?
by atomic mass
Elements in the same group on the periodic table can be expected to have:
similar properties
same number of valence electrons
A positive ion is known as:
a cation
The ability for one atom to attract electrons from a different atom is called
electronegativity
What separates the metals from the nonmetals on the periodic table?
The staircase or the metalloids
Mendeleev isn't just famous for making a periodic table but using it to do what?
correctly predict the existence and properties of undiscovered elements during his time
Who created the modern periodic table
Ionization Energy
The atoms get smaller
Why doesn't the potassium that is in Gatorade (electrolytes!) explode if the Gatorade also contains water.
The potassium in the Gatorade is already an ion. The metallic potassium explodes in water because it is going through a chemical reaction to become an ion.
True or False: We use Mendeleev's version of the Periodic Table today
False
Which of the following elements is in the d block?
Calcium (Ca), Silver (Ag), Arsenic (As), Thorium (Th)
Silver (Ag)
Which ion is bigger?
Mg2+ or S2-
S2-
Explain electron shielding
If there are a lot of electrons in between the nucleus and the valence electrons, then they weaken the affect of the nuclear charge. Those valence electrons are not pulled as much towards the nucleus.
Give the following information on the element Cobalt (Co)
Metal/Nonmetal/Metalloid?
Block, Period, & Group?
Valence Electrons?
Cobalt (Co) is a metal in the d block.
It is in period 4, group 9.
It has 2 valence electrons
Will the element Mercury (Hg) form a cation or an anion?
cation
metals form positive ions; nonmetals form negative ions
When elements are arranged by increasing atomic number, the properties of those elements showing a periodic pattern is called
periodic law
Put the following elements in order of increasing ionization energy:
Titanium (Ti), Rutherfordium (Rf), Hafnium (Hf), Zirconium (Zr)
Rutherfordium (Rf) < Hafnium (Hf) < Zirconium (Zr) < Titanium (Ti)
Which element has the greatest electronegativity?
Fluorine
Which block on the periodic table contains all three types of elements: metals, nonmetals, and metalloids
the p block