Periodic Trends
What is a cation?
A positively charged atom (ion).
Write the isotope symbol for the information below:
10 protons
9 neutrons
10 electrons
What is:
19 Ne
10
Third period, eight valence electrons.
As you move across a period, what happens to the atomic radius and why?
The atomic radius decreases because there are more protons (greater nuclear pull).
The organizer of the modern Periodic Table
Who is Dmitri Mendeleev
Which element is more electronegative: Mg or Sr
What is Mg
How many neutrons does potassium-40 have?
What is 21.
The halogen with electrons in the fifth energy level.
Iodine, I
What is the term for the amount of energy to remove an electron?
What is ionization energy?
This group of elements belongs to the family that has 7 valence electrons.
Who are the halogens.
Define "shielding"
What is when the nucleus is blocked from the outer electrons by layers of energy levels (this causes outer electrons to be less attracted to the nucleus).
Write the isotope name for the following:
33 protons
41 neutrons
33 electrons
What is Arsenic-74
Period 3 metalloid
Silicon, Si
As you move down a group, what is the trend for electronegativity and why?
The electronegativity decreases due to the nucleus being shielded by multiple layers of electrons (energy levels).
What do atoms of elements that are in the same group have in common?
They contain the same number of valence electrons.
These atoms ranked from largest to smallest ionization energy: N, O, and F.
F, O, N
Find the following for the isotope: Cobalt-59.
mass:
protons:
neutrons:
electrons:
What is:
mass: 59
protons: 27
neutrons: 32
electrons: 27
Group 5A nonmetal.
Nitrogen or Phosphorus
Which element has the greatest electronegativity?
What is fluorine.
These elements are dull, brittle and poor conductors of electricity.
What are non-metals (located on the right side)
Rank these elements according to atomic radius from largest to smallest: K, Rb, Ca, Be, Mg
What is when the nucleus is blocked from outer electrons by layers of energy levels (this makes the outer electrons less attracted to the nucleus).
Find the following for Iodine-126
mass:
protons:
neutrons:
electrons:
What is:
mass: 126
protons: 53
neutrons: 73
electrons: 53
An alkaline Earth metal that has a smaller atomic radius than calcium.
Beryllium, Be or Magnesium, Mg
Which family on the periodic table has no electronegativity? Why?
What is the noble gases because they already have a full outer ring.
How many groups are on the Periodic Table
What is 18