Periodic Law
He was the first to organize a periodic table
Dmitri Mendeleev
The columns of the periodic table are known as
Groups/Families
Which part of the periodic can you find the metalloids?
Staircase/zigzag
Rule that says that atoms tend to form groups of 8 electrons in their valence energy level
Octet Rule
What do you call atoms that lose or gain electrons?
Ions
He discovered the protons
Henry Moseley
The rows in the periodic table are known as
These elements are lustrous, malleable, and ductile
Metals
This is the pull that electrons feel towards the nucleus
Effective Nuclear Charge
What happens to the size of an atom if it becomes a cation?
Smaller/decrease
Mendeleev organized the periodic table based on increasing
Atomic Mass
Which group of metals are the most reactive?
Group 1A or Alkali Metals
These elements are dull, brittle, and insulators
Nonmetals
What happens to the size of the atom across a period?
Decreases/Smaller
What happens to the size of an atom when it becomes an anion?
Bigger/Increase
The modern periodic table is organized based on increasing
atomic number/protons
Which group of nonmetals are the most reactive?
Group 7A or Halogens
These elements have characteristics of both metals and nonmetals
Metalloids
Why do atoms down a group grow bigger?
Added rings
When an atom gives away an electron it becomes what type of ion?
Cation
When elements are arranged by increasing atomic number, they display a
Regular and Repeating Pattern
Which group of elements have a full valence shell?
Group 8A or Noble Gases
What metalloid is widely used as semiconductor?
Silicon
Electrons are less attracted to the nucleus when they are farther away. Name this effect
Shielding effect
When an atom takes an electron it becomes what type of ion?
Anion