Periodic Trends 1
Which atom is bigger- Na or Mg?
Sodium
Atomic radius _____ across the period
Decreases
Which atom is bigger- B, C, Al?
Al
Atomic radius _____ down the group
Increases
Which is bigger- Be or Si?
Si
He created the first periodic table, and predicted the existence and properties of new chemical elements. His periodic table was based on atomic weights instead of atomic number.
Dmitri Mendeleev
One-half the distance between the nuclei of two atoms. Increases towards bottom-left corner of periodic table.
Atomic Radius
Highest Ionization Energy: Ge, Se, Cu, Br, Co
Br
Which is bigger- H or He?
H
Lower ionization energy: Po or Lv
Lv
Which is bigger- C,P or S?
S
Higher ionization energy: Rn or W
Rn
He is known for his establishment of truly scientific basis of the Periodic Table of the Elements by sorting chemical elements in the order of their atomic numbers.
Henry Moseley
A chemical property describing an atom's ability to attract and bind with electrons. It increases towards the top-right corner of the periodic table.
electronegativity
Which element has the largest atomic size- He, F, Ar or Na?
Na
Which element in Period 2 has biggest atomic radius?
Lithium
Which is bigger- Mg or Ca?
Ca
Highest ionization energy: Yttrium, Tin, Antimony, Iodine, Cadmium
Iodine
Highest ionization energy: Bismuth, Antimony, Phosphorus
Phosphorus
A column of elements in the periodic table. There are 18 of these in the periodic table containing elements with similar properties.
Groups
The energy required to remove an electron from a neutral atom in its gaseous phase. Conceptually, it is the opposite of electronegativity. Increases towards the top-right corner of the periodic table.
ionization energy
Two elements belong to the same period. A is an alkali metal and B is an alkali-earth metal. Which has bigger radius?
A
Biggest: Pt, Au, Cd, Sn, Rf, Sr
Rf
Smallest: Titanium, Vanadium, Ruthenium, Indium Sulfur
Sulfur
Atomic radius is the _____ distance between the atom’s nuclei and the _____ of the atom.
Shortest; Outermost shell
Which element in Period 3 has smallest atomic radius?
A row of elements in the periodic table. Elements of the same row have the same number of electron shells.
period
What law states that many of the physical and chemical properties of the elements tend to recur in a systematic manner with increasing atomic number?
Periodic Law
Which atom has bigger atomic size- Cl or Ar?
Chlorine
Which element has the largest atomic size- F, O, S or Cl?
S
From the first 20 elements, which alkali metal has bigger atomic size?
What is the largest atom?
Francium
Which of the atoms has the smallest atomic radius- O, Ne, B or Li?
Neon
Electrons that appear in the outermost shell of an atom. They can participate in the formation of a chemical bond. They determine the ordering of groups in the periodic table.
Valence Electrons
What is a positive ion called and what is a negative ion called?
A positive ion is called a cation. A negative ion is called an anion.