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exam study stacks

the periodic table is made of? periods and groups.
what are the two main sections of the periodic table? metals and nonmetals.
metal is an element that? is a good electrical conductor and a good heat conductor.
what metal is a liquid at room temperature? mercury.
boiling point of copper? 2567 degreees celsius.
many nonmetals are what at room temperature? gases.
phosphorus is one of the how many solid nonmetals? five.
metalloids have some characteristics of what and what? metals and nonmetals.
the study of the compositon, structure, and properties of matter is? chemistry.
all matter has? mass.
a logical approach to solving problems that len themselves to investigation? the scientific method.
testable statement that serves as the basis for predicitions and experiments? hypothesis.
mesurements for science? SI system.
weight is a measure of what on matter? gravitational pull.
density is the ratio of what to what? mass to volume.
what is used to convert from one unit to another? conversion factors.
what is the closeness of a measurement to the correct or accepted value? accuracy.
difference between the experimental value and the accepted value? percentage error.
all digits known with certainty plus one final digit, which is uncertain is? significant figures.
what factors are completely certain? conversion factors.
atoms have been around since the time of? ancient greeks.
who proposed the scientific theory of atoms? John Dalton.
matter and mass cannot be what in chemical reactions? created or destroyed.
cathode-rays supplied evidence of? electrons.
what are negatively charged subatomic particles? electrons.
Rutherford found evidence of? atomic nucleus.
how did rutherord find atomic nucleus? bombarding metal foil with a beam of positively charged particles.
atomic nuclei are composed of? protons.
atomic number of an element is equal to? number of protons of an atom of that element.
the mass number is equal to? the total number of protons and neutrons in the nucleus.
what is the total number of electrons need to fill the first two main energy levels? 10.
atomic sublevel with the nest highest energy after 4p is? 5s.
because excited hydrogen atoms always produce the same line-emission spectrum, scientists concluded that hydrogen? released photons of only certain energies.
number of orbitals for the d sublevel is? 5.
emission of electrons from metals that have absorbed photons is called the? photoelectric effect.
main energy levels of an aom are indicated by? principal quantum numbers.
main energy level that can hold only 2 electrons? first.
one of the wave properties of electromagentic radiation, such as light, is? frequency
in SI, the frequency of electromagnetic radiation is measured in? hertz.
for the f sublevel, the number of orbitals is? 7.
Mendeleev noticed the properties of elements usually repeated at regular intervals when the elements were arranged in order of increasing? atomic mass.
what are the radioactive elements with atomic numbers from 90 to 103 in the periodic table called? actinides.
the discovery of noble gases changed mendeleev's periodic table by adding a new? group.
what are the elements with atomic numbers from 58 to 71 in the periodic table called? lanthanides.
to which group do potassium and lithium belong? alkali metals.
elements in a group or column in the periodic table can be expected to have similar? properties.
mendeleev predicted that the spaces in his periodic table represented? undiscovered elements.
in the modern periodic table, elements are ordered according to? increasing atomic number.
the most useful source of general information about the elements for anyone associated with chemistry is a? periodic table.
argon, krypton, and xenon are? noble gases.
a mutual attraction between the nuclei and valence electrons of different atoms that bind the atoms together is called a(n)? chemical bond.
the elements involved in the formation of a chemical bond are called? valence electrons.
atoms are ____ when they are combined? more stable.
the chemical bond formed when two atoms share electrons is called a(n)? covalent bond.
if two covalently bonded atoms are identical, the bond is? nonpolar covalent.
when atoms share electrons, the electrical attraction of an atom for the electrons is called the atom's? electronegativity.
if the atoms that share electrons have an unequal attraction for the electrons, the bond is called? polar.
a covalent bond results when ___ are shared? electrons.
a neutral group of atoms held together by covalent bonds is a? molecule.
a ___ shows the types and numbers of of atoms joined in a single molecule of a molecular compound? molecular formula.
Created by: pilot5