Chemistry Test

Explain what an atom is.
Atom- the smallest particle of an element
Identify what particles atoms are composed of.
Atoms are composed of protons, electrons, and neutrons.
Identify particle charge and location.
Protons- small, positively charged particle in the nucleus of an atom (+)
Electrons- tiny, negatively charged, high energy, particle outside the nucleus of an atom (-)
Neutrons- small uncharged particle in the nucleus of an atom
Explain what the atomic number of an atom represents.
The atomic number of an atom represents the number of protons in the nucleus of an atom. (Could represent electrons)
Explain what the atomic mass of an atom represents.
The atomic mass of an atom represents the average mass of one atom of an element.
Be able to identify/solve for number of neutrons.
Atomic mass-atomic number (protons)= # of neutrons
Correctly identify the atomic number, mass, symbol, and name of a given element.
Example:
Atomic #: 1
Element Symbol: H
Element name: Hydrogen
Atomic mass: 1.00794
Describe what an electron shell is.
“Orbit” followed by electrons around an atom nucleus
Each shell can only contain a fixed amount
Each shell must be filled before e-3 can fill next shell
Identify the maximum number of electrons found in each shell.
Follow formula of 2(n2)
Shell #1= 2 shells Shell #2= 8 shells
Shell #3= 18 shells Shell #4= 32 shells
Use atomic number to complete electron shell diagrams.
Example: Lithium
Shell #1: 2 Shell #2: 1
Distinguish between a group and period.
A group are the vertical columns on a periodic table (18 groups)
A period are the horizontal rows on a periodic table (7 periods)
Correctly identify elements based upon group and period coordinates
(Ex. Group 2 Period 2 = Beryllium)
Describe what valence electrons are.
Valence electrons are the electrons that are farthest away from the nucleus of an atom and involved in chemical reaction
# of valence electrons can range from 1 to 8
Identify the number of valence electrons for an element.
The number of valence electrons for an element can be determined by the # of electrons on the outermost shell
The number of valence electrons for an element can also be determined by the group the element is in, and the last digit of groups determines valence electrons (Group 13 for Aluminum so there are 3 valence electrons)
Create an electron dot diagram for an element.
Look for picture on google on electron dot diagram…
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