Subatomic Particles
This particle has a positive charge and is found in the nucleus.
A proton
The center of the atom, where protons and neutrons are located.
nucleus
An atom that has gained or lost electrons.
ion
This number tells you how many protons an atom has.
Atomic Number
If an atom has 6 protons and 6 neutrons, what is its mass number?
12
This particle has no charge and adds mass to the atom.
A neutron
The region where electrons are likely to be found.
electron cloud
An atom with the same number of protons but a different number of neutrons.
isotope
This element has an atomic number of 1.
Hydrogen
An atom has 8 protons and 10 neutrons. What is its atomic mass?
18amu
This negatively charged particle orbits the nucleus.
An electron
The total number of protons and neutrons in an atom.
mass number
This type of ion has more electrons than protons.
Negative Ion
This element has 11 protons.
Sodium
An atom has 15 protons and 18 electrons. What is its charge?
-3
The number of these particles determines the element’s identity.
protons
The number of protons in an atom.
mass number
This type of ion has fewer electrons than protons.
Positive Ion
This element is in Group 17 and forms -1 ions.
Halogen
An ion has 12 protons and 10 electrons. What is its charge?
+2
These two particles together make up the atomic mass.
protons and neutrons
This model shows electrons in energy levels around the nucleus.
Bhor Model
Carbon-12 and Carbon-14 are examples of these.
Carbon Isotopes
These elements are in groups 3-12 and don't form consistent ions.
Transition Metals
An atom has a mass number of 23 and 11 protons. How many neutrons does it have?
12