Periodic Table History and arrangement
Who is the father of the Periodic Table?
Dmitri Mendeleev
What group is the Boron family?
Group 13
The three classes of elements are these.
metals, metalloids, and nonmetals
Arsenic (As) has 42
neutrons
Group 13, Period 4
Gallium
Al
Aluminum
Carbon
C
Elements are put into rows by increasing _____
Atomic number
This group and type of metal on the periodic table includes magnesium, calcium, and barium?
Group 2, alkaline earth metals
The very reactive elements in group 1 are known as this.
alkali metals
The Atomic mass minus the Atomic number =
The number of neutrons of an atom?
Group 16, Period 2
Oxygen
Ni
Nickel
Gallium
Ga
What are the horizontal rows called and how are they numbered?
The vertical columns on the periodic table.
groups / families
The name of the group in the periodic table that includes magnesium, calcium, and barium is called?
alkaline earth metals
The electrons in the outer most shell are known as?
valence electrons
Group 17, period 4
Bromine
As
Arsenic
Iron
Fe
What are the vertical columns called and how are they numbered?
Groups (1-18)
The elements in group 17 are known as this.
halogens
Argon, Kryton, and xenon are......
noble or inert gases
The atomic number is equal to this on a neutral atom
The number of protons and electrons?
Atomic number 9
Fluorine
Kr
Krypton
Cadmium
Cd
Why are certain elements in the group have similar physical and chemical properties?
They have the same number of valence electrons
The nonreactive elements in group 18 are known as this.
noble/inert gases
Being brittle, dull, and insulators are properties of this class of elements.
nonmetals
Number of periods on the periodic table.
7
This element has 47 protons, 61 Neutrons and 47 Electrons
Silver (Ag)
Ts
Tennessine
Lead
Pb