The electrons in the outer energy level
What are valence electrons?
Subatomic Particle with a negative charge
What is an electron?
The atomic number is equal to this
What is the number of protons (and electrons) an atom of an element has?
Atomic mass - Atomic number
What is the formula for finding the neutrons of an atom?
A subatomic particle with no charge.
What is a neutron?
The location of protons and neutrons.
What is inside the nucleus?
How many elements are located on the Periodic Table?
118
What is the smallest element on the periodic table?
Hydrogen
Arsenic (As) has 33 of these.
What are protons and electrons?
The location of electrons.
What are energy shells or orbitals?
Columns (up and down) on a periodic table
What are groups?
An atom’s mass number is 210 and its atomic number is 85. How many neutrons does the atom have?
125
The number of protons in an atom of Carbon.
6
What is 11.
Elements in the same group share this.
What are the same number of valence electrons
The maximum number of electrons the 1st orbital, or energy shell, can hold.
What is 2?
Elements in groups 3-12 are called what?
Transition Metals
The majority of the elements on the periodic table are this.
What are metals?
The amount of energy orbitals that Calcium has.
What is 4?
The most reactive groups on the periodic table.
Group 1(Alkali Metals) and 17 (Halogens)
The mass number of this atom of oxygen

What is 16?
This group is not reactive at all.
What is group 18 (Noble Gases)?
Elements in group 1 have only 1 valence electron and are considered this.
What are Alkali Metals?
The subatomic particle with no mass
What is the electron.
The amount of valence electrons that chlorine has.
What is 7?