Periodic Table 1
The electrons in the outer energy level
What are valence electrons?
An atom with a negative charge
What is an electron? Who discovered it?
The atomic number tells you
What is the number of protons (and electrons) an atom of an element has?
An atom with a positive charge.
What is a proton? Who discovered it?
A subatomic particle with no charge/chadwick
What is a neutron? Who discovered it?
The location of protons and neutrons.
What is inside the nucleus?
An atom with a completely full outer most (valence) energy level is this.
What is nonreactive also known as the Noble Gases
heavier versions of the same element; different number of neutrons/same number of protons
What are isotopes?
Found in a zigzag line on the periodic table.
What are metalloids?
The location of electrons.
What is outside the nucleus?
Atomic mass - Atomic number
What is the formula for finding the neutrons of an atom?
8
What is the maximum number of electrons the 2nd orbital, or energy shell, can hold?
Rows on the periodic table; energy levels/shells
What are periods? What do they tell us?
Columns on a periodic table
What are groups?
Elements in the same group share this.
What are the same number of valence electrons
atomic mass and chemical properties
What Mendeleev organized the periodic table according?
The alkali metals = 1 valence electron
The alkaline earth metals= 2 valence electrons
Name the first two chemical families
how many valence electrons?
The majority of the elements on the periodic table are this.
What are metals?
These are the properties of metalloids.
What are many properties of both metals and nonmetals?
The three classes of elements are these.
What are metals, metalloids, and nonmetals?
what is the difference between the decimal mass and the whole number mass of an element?
Mosely; protons
Who organized the periodic table according to atomic number?
What did he say increases periodically?
Elements in group 1 have only 1 valence electron and are considered this.
What are elements that are considered extremely reactive?
The reactivity of an element is dependent on this.
What is the ability of an atom to either completely fill or empty its outer most energy level?
Located on the right side of the zigzag line.
What are nonmetals?