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The periodic law
the relationship in which the physical and chemical properties of elements show a periodic pattern when the elements are arranged by increasing atomic number is called
the chemical propertiesw of unknown elements and the existance of unknown elements
Mendeleev's periodic table was able to predict_____
which category of elements is commonly used to make computer ships and solar cells due to their ability to conduct electricity only under certain conditions (semiconductors)
an element can be identified by the characteristic bright-line atomic emission spectrum it can produce
electrons must be added one at a time to the lowest energy orbitals available according to the
occupy equal energy orbitals so that a maximum number of unpaird electrons result
Hand's rule states that electrons
2 electrons with the opposite spin
the Pauli exclusion principal states that each orbital in an atom can hold
position and velocity
the heisenberg uncertainty principle states that 2 things of an electron cannot be simultaneously measured
Which scientist described a positively charged core (nucleus) in the middle of a lot of empty space?
protons and neutrons
According to the modern concept of the atom, which are located in the nucleus of an atom.
isotopes are forms of an elements that have the same number of protons but a different number of electrons
The simplest whole number ratio of different atoms in a compound
An emperical formula always indicates
Elements tend to gain or lose electrons in order to acquire the electron confirguration of a
A crystal lattice is a 3d structure formed by positive ions surrounded by negative ions surrounded by positive ions
Because of the number of negative ions packed around each positive ion in a crystal lattice, ionic compounds are good conductors of electricity and heat in their solid state
The oxidation number or charge of an ion ids always equal to the number of valence electrons it has
number of beats
A scientist designed a new drug to help slow the beating of the heart, and is interested in the beats of the heart with time. The scientist measures the beats of the heart every ten seconds. What is the dependent variable?
If the distance covered by a car at constant speed for different intervals of time, then the distance is a dependant variable
The volume of a baloon increases as it is heated. The volume of the ballon is the dependant variable.
if an accidental discovery is made, it means something went wrong with the experiment and the results should be discarted.
A chemical composition of two or more different elements joined together in fixed proportions isk nowns as a
the mass of reactants is equal to the mass of products
According to the Law of conservation of mass, in any chemical change,
The Law of _____ states that a compound is always composed of the same elemensts in the same proportion by mass
what is the seperation technique that relies on the different boiling points of the parts of the mixture?
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