review for ps-2 – properties of atoms. atoms are made up of – protons – neutrons – electrons
TRANSCRIPT
Review for PS-2 – Properties of Atoms
Atoms are made up of – Protons– Neutrons – Electrons
What type of charges do all particles have– protons= positive– Electrons= negative– Neutrons= neutral
Where is everything in an atom located?– Protons – nucleus– Neutrons- nucleus– Electrons- electron cloud or energy level
How much does each particle weigh?– Protons- 1 amu– Neutrons-1 amu– Electrons- 0 amu
Periods are ____________________ horizontal Groups are ____________________ vertical
The maximum number of electrons that the first energy level? Second energy? can hold is
2 8
What are the symbols for Chlorine and Magnesium?
Cl Mg
Can the EXACT location of the electron be located?
NO
The identity of an atom is determined by its Number of protons The group number of an atom indicates its Number of valence electrons AND its
chemical properties
How do you find the number of neutrons? MASS NUMBER- ATOMIC NUMBER How do you find the number of protons of an
atom? ATOMIC NUMBER How do you find the mass number? Add the number of neutrons that the problem
gives you to the number of protons
The smallest unit of matter is The atom
What are the names of groups 1,2,17 and 18 Alkali metals, alkaline earth metals, halogens
and noble gases
If an atom loses electrons, it is a _________ ion?
positive
Lewis dot diagrams are used to represent _________.
Valence electrons
At room temperature most non-metals are _________________
gas
Neutrons released in a fission reaction could cause a ________ ____________.
Chain reaction
For Magnesium, what is the… Atomic number- 12 Average atomic mass-24.31 Number of neutrons-12 Number of valence electrons-2 Oxidation number +2 Group number 2 Period number 3
What is an isotope? Same atom (element) with a different number
of neutrons and a different mass number
Draw a Lewis structure and a Bohr’s model for oxygen
A ___________ reaction is a nuclear reaction that involves the joining of two or more nuclei of atoms
Fusion A ___________ reaction is the splitting of
nuclei. fission
Like charges ____________. Repel Unlike charges __________. attract
Write the isotope notation for the three isotopes of H.
H-1 OR H-2 OR H-3 OR
What are some benefits of radioactive isotopes?
Diagnosing medical problems, dating fossils What are some benefits of nuclear
reactions? Power reactors, treatment of cancer