Flashcards in Unit 2 Key Terms Deck (169)
Law of Conservation (of matter)
mass (or matter) is not created or destroyed in chemical reactions.The total mass of all products equals the total mass of all reactants
Law of Constant Composition (Law of Definite
compounds consist of elements combined
in definite proportions by mass.
Points which Dalton's Atomic Theory were wrong
1) Atoms can be divided - they consist of smaller particles
called protons, neutrons, and electrons (subatomic
2) Atoms of the same element can have different masses
What are the 3 subatomic particles and their charges
What was the first subatomic particle discovered?
1.6726 x 10-24 g or 1.007 amu
1.6749 x 10-24 g or 1.008 amu
9.109 x 10-28 g or 0.000549 amu
Equal to the number of Protons in the nucleus
Like charges ___ and Unlike charges ___
1.6605387 x 10-24 g
An atom is electrically _____
Protons+Neutrons= Mass Number
If an atom (or isotope) of oxygen contains 8
protons, 10 neutrons, and 8 electrons, what is its
1) atomic number, 2) net charge, 3) mass number?
1) 8 (Oxygen) (O)
Atoms of the same element that have different mass numbers
How many protons are in any zinc atom?
How many neutrons are in a zinc atom with a
mass number of 65?
What is the mass number of a different zinc
isotope that has 37 neutrons in its nucleus?
In an atomic or isotopic symbol. the mass number is the ___ and the atomic number is the ____
Ions are formed when
• form when atoms lose or gain electrons.
• have unequal numbers of protons and electrons.
• have a net electrical charge.
Groups of bonded atoms with a net
charge are called
Ions derived from single atoms are called
A + in superscript on an Ion is representative of
A - in superscript on an ion is representative of
Metal ions have the same name as
the parent atom
Na-Sodium Na+ Sodium Ion
Atoms of nonmetals can gain electrons to reach an octet, forming
Monatomic anions are named by taking the root of the
element name and adding
O = oxygen atom F = fluorine atom
O2− = oxide ion F− = fluoride ion
N = nitrogen atom Br = bromine atom
N3− = nitride ion Br− = bromide ion