prefixes
scientists
bonding
periodic table
moles
100
What is the prefix for the number 9?
nona
100
Who believed that atoms were invisible and indestructible?
democritus
100
What are valence electrons?
the electrons in the highest occupied energy level of an elements atoms
100
On the modern periodic table, how are the elements arranged?
increasing atomic number
100
How do you often measure the amount of something?
count, mass, volume
200
What is the prefix for the formula Cl2O8
dichlorine octoxide
200
Which scientist's theory of the atom is accepted today?
Dalton
200
What is the charge of a cation?
positive
200
What are the three classes of elements on the period table?
metals, nonmetals, and metalloids
200
What is Avogadro's number?
6.02x10 23
300
What is the prefix for the number 4?
tetra
300
Rutherford believed that atoms contain what?
mostly empty space, nucleus made up of protons and neutrons
300
Sodium Chloride is an example of what kind of compound?
ionic compound
300
Atomic size ____ from top to bottom within a group, and _____ from left to right across a period.
increases; decreases
300
What is the mass of a mole of an element?
molar mass
400
What is the name of the following compound: SF6?
sulfur hexaflouride
400
What is J.J. Thompson's model known as?
chocolate chip cookie, plum pudding
400
Most ionic compounds are ________ at room temperature.
chrystaline solids
400
What happens to ionic size as you move across a period?
decreases
400
What does STP stand for?
standard temperature and pressure
500
What is the prefix for 5?
penta
500
Who's model of the atom did the electron move in a circular orbit at fixed distances from the nucleus?
Bohr
500
What is a covalent bond?
a bond formed by the sharing of electrons between atoms
500
Shielding effect is _____ as you move across a period and, _____ as you move down a group.
constant; increases
500
Definition: Equal volumes of gases at the same temperature and pressure contain equal numbers os particles.
Avogadro's hypothesis
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