the periodic table
Who were the first to develop the periodic table we know today?
Mendeleev and Moseley
Where are metals and non metals on the periodic table?
Metals are mostly on the left and non metals are on the right
The total distance from an atom's nucleus to the outermost orbital of electron.
Atomic Radius
What is ionization energy?
the amount of energy required to remove an electron from an isolated atom or molecule.
In what directions does electronegativity increase on the periodic table?
From the left to the right and from the bottom up.
What are periods?
The horizontal rows in the periodic table that signify the number of electron shells in an element.
What are groups?
vertical column of the periodic table, based on the organization of the outer shell electrons
What is electronegativity?
The measure of the attraction of an atom for the electrons in a bond.
The amount of energy required to remove the outermost electron from a gaseous atom in the ground state is known as___
The first ionization energy
On the present periodic table of the elements, the elements are arranged according to increasing___
Atomic number
a chemical element that possesses properties that fall between those of typical metals and nonmetals
What are metalloids?
Describe the halogen group
The halogen group, also known as Group 17 on the periodic table, is a collection of highly reactive non-metal elements that readily form salts when combined with metals
What are the characteristics of most nonmetals?
17. Which of the following are characteristic of most nonmetals?
1
What is metallic reactivity/character?
how readily an element can lose electrons and participate in chemical reactions
What increases as you go left to right across the period and from top to bottom within a group?
Electronegativity and ionization energy
List three of the noble gases without looking on your periodic table.
Helium, neon, argon, krypton, xenon or radon
What is the difference between alkali metals and alkali earth metals?
The key difference between alkali metals and alkaline earth metals is that alkali metals have one valence electron in their outer shell, while alkaline earth metals have two, making alkali metals generally more reactive than alkaline earth metals
List all the differences between metals and non metals
Metals are typically shiny, malleable, ductile, and good conductors of heat and electricity, while non-metals are dull, brittle, poor conductors, and lack the ability to be easily shaped into wires or sheets.
What are allotropes?
Two or more forms of an element that exist in the same physical state of matter but have different properties.
What decreases as you go left to right across the period and from top to bottom within a group?
Atomic radius, ionic radius and metallic reactivity/character
Use your reference table s to fill in the first ionization energies for the representative metals below: (with units!)
Metals:
1. Lithium
2. Sodium
3. Potassium
4. Rubidium
1. 520
2. 496
3. 419
4. 403
Use your reference table s to fill in the first ionization energies for the representative non metals below: (with units!)
Non Metals:
1. Fluorine
2. Chlorine
3. Bromine
4. Iodine
1. 1681
2. 1252
3. 1140
4. 1008
a reduction in the effective nuclear charge on the electron cloud, due to a difference in the attraction forces on the electrons in the atom.
The shielding effect