Subatomic Particles
Positively charged particles found in the nucleus of an atom.
Protons
+1
Chemical symbols are ALWAYS the first two letters of an element's name [True/ False]
False
The periodic table contains all of the [elements/ compounds] in the universe.
Elements
The outmost electron shell of an atom is called the...
Valence shell
Negatively charged particles found in the electron cloud.
Electrons
One electron has this charge(+1, 0, or -1)
-1
The chemical symbol for Chlorine can be written correctly as CL [True/ False]
False
The atomic number is the number of ____ in an atom.
Protons
The electrons found in the outmost shell of an atom are called the...
valence electrons
Neutral particles (no charge) found in the Nucleus of an atom.
An atom with 5 protons needs _____ electrons to have a neutral (0) charge.
5
hydrogen
If you add the protons and neutrons in an atom, it will give you the... [atomic number/ atomic mass]
Atomic mass
An atom is happiest (most stable) when its valence shell is...
full
Two particles found in the nucleus of an atom
Protons and Neutrons
At atom with 10 electrons needs ____ protons to have a neutral (0) charge.
10
O is the chemical symbol for ...
Oxygen
The column on the FAR RIGHT of the periodic table is called the [metals/ noble gasses]
Noble gasses
The first valence shell can hold ___ electrons.
2
These two particles make up virtually ALL the mass of an atom
Protons & Neutrons
An atom as 3 protons and 2 electrons. What is its charge?
+1
C is the chemical symbol for...
Carbon
As you move DOWN or to the RIGHT in the periodic table, atoms become... [bigger/ smaller]
Bigger
The 2nd, 3rd, and 4th valence shells of an atom can hold ___ electrons each.
8