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MUS science exam rev

science mus

QuestionAnswer
the smallest unit of the element that keeps the same properties of the element atom
an atoms central region, which is made up of protons and neutrons nucleus
a region around the nucleus of an atom where electrons are likely to be found electron cloud
Who thought that matter was composed of atoms Democritus
Who based his theory on observations of how elements combine Dalton
Who discovered electrons in an atom Thompson
Who discovered that atoms are mostly empty space with a dense, positive nucleus Rutherford
Who proposed that electrons are located in levels at certain distances from the nucleus Bohr
a subatomic particle that has a positive charge and is found in the nucleus of an atom proton
a unit of mass that describes the mass of an atom or molecule atomic mass unit
a subatomic particle that has no charge and is found in the nucleus of an atom neutron
What are found in all atoms? Protons and Electrons
the number of protons in the nucleus of the atom; the atomic number is the same for all atoms of an element atomic number
an atom that has the same number of protons of other atoms of the same element do but that has a different number of neutrons (and thus a different atomic number) isotope
the sum of the numbers of protons and neutrons in the nucleus of an atom mass number
the mass of an atom expressed in atomic mass units atomic mass
ordindary-sized objects are made up of very large numbers of atoms atoms are extremely small
What consist of a nucleus, which has protons and usually neutrons, and electrons, located in electron clouds around the nucleus? Atoms
What is the number of protons in the nucleus of a atom? atomic number
All atoms of an element have the same what? atomic number
Different isotopes of an element have... different numbers of neutrons in their nuclei.
Isotopes of an element share... most chemical and physical properties
The mass of an atom is... the sum of the atom's neutrons and protons
What is a weighted average of the masses of natural isotopes of an element? Atomic mass
What are the forces at work in an atom? gravitational force, electromagnetic force, strong force, and weak force.
something that occurs or repeats at regular intervals periodic
the law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements periodic law
what are four properties shared by most metals solid at room temperature, ductile, malleable, and shiny. most are good conductors or electric currents and thermal energy.
properties of nonmetal not malleable or ductile, not shiny and are poor conductors of thermal energy and electric currents
properties of metals shiny, ductile, good conductors of electric currents, malleable, and good conductors of thermal energy
properties of metalloids shiny, brittle, & good conductor of electric currents
a horizontal row of elements in the periodic table period
a vertical column of elements in the periodic table; elements in a group share chemical properties group
how did Mendeleev develop the first periodic table? by listing the elements in order of increasing atomic mass
properties of what repeat in a regular, or periodic pattern properties of elements
one of the elements of group one on the periodic table Alkali Metals
one of the elements on group two on the periodic table alkaline-earth metals
why are alkali metals more reactive than transition metals it is easier for alkali metals to loose their outer shell of electrons than for transition metals
the hardest material known diamond
formed from burning oil, coal, and wood and is used as a pigment in paints and crayons soot
all of the elements of group 18 of the periodic table; are unreactive
what are four properties shared by most metals solid at room temperature, ductile, malleable, and shiny. most are good conductors or electric currents and thermal energy.
a horizontal row of elements in the periodic table period
a vertical column of elements in the periodic table; elements in a group share chemical properties group
how did Mendeleev develop the first periodic table? by listing the elements in order of increasing atomic mass
properties of what repeat in a regular, or periodic pattern properties of elements
why are alkali metals more reactive than transition metals it is easier for alkali metals to loose their outer shell of electrons than for transition metals
the hardest material known diamond
formed from burning oil, coal, and wood and is used as a pigment in paints and crayons soot
what are four properties shared by most metals solid at room temperature, ductile, malleable, and shiny. most are good conductors or electric currents and thermal energy.
properties of nonmetal not malleable or ductile, not shiny and are poor conductors of thermal energy and electric currents
properties of metals shiny, ductile, good conductors of electric currents, malleable, and good conductors of thermal energy
properties of metalloids shiny, brittle, & good conductor of electric currents
a horizontal row of elements in the periodic table period
a vertical column of elements in the periodic table; elements in a group share chemical properties group
how did Mendeleev develop the first periodic table? by listing the elements in order of increasing atomic mass
properties of what repeat in a regular, or periodic pattern properties of elements
why are alkali metals more reactive than transition metals it is easier for alkali metals to loose their outer shell of electrons than for transition metals
the hardest material known diamond
formed from burning oil, coal, and wood and is used as a pigment in paints and crayons soot
one of the elements of group seven-teen of the periodic table halogen
what are four properties shared by most metals solid at room temperature, ductile, malleable, and shiny. most are good conductors or electric currents and thermal energy.
properties of nonmetal not malleable or ductile, not shiny and are poor conductors of thermal energy and electric currents
properties of metals shiny, ductile, good conductors of electric currents, malleable, and good conductors of thermal energy
properties of metalloids shiny, brittle, & good conductor of electric currents
a horizontal row of elements in the periodic table period
a vertical column of elements in the periodic table; elements in a group share chemical properties group
how did Mendeleev develop the first periodic table? by listing the elements in order of increasing atomic mass
properties of what repeat in a regular, or periodic pattern properties of elements
why are alkali metals more reactive than transition metals it is easier for alkali metals to loose their outer shell of electrons than for transition metals
the hardest material known Diamond
formed from burning oil, coal, and wood and is used as a pigment in paints and crayons Soot
what are four properties shared by most metals solid at room temperature, ductile, malleable, and shiny. most are good conductors or electric currents and thermal energy.
properties of nonmetal not malleable or ductile, not shiny and are poor conductors of thermal energy and electric currents
properties of metals shiny, ductile, good conductors of electric currents, malleable, and good conductors of thermal energy
properties of metalloids shiny, brittle, & good conductor of electric currents
a horizontal row of elements in the periodic table period
a vertical column of elements in the periodic table; elements in a group share chemical properties group
how did Mendeleev develop the first periodic table? by listing the elements in order of increasing atomic mass
properties of what repeat in a regular, or periodic pattern properties of elements
one of the elements of group one on the periodic table Alkali Metals
one of the elements on group two on the periodic table alkaline-earth metals
why are alkali metals more reactive than transition metals it is easier for alkali metals to loose their outer shell of electrons than for transition metals
the hardest material known diamond
formed from burning oil, coal, and wood and is used as a pigment in paints and crayons soot
what are four properties shared by most metals solid at room temperature, ductile, malleable, and shiny. most are good conductors or electric currents and thermal energy.
properties of nonmetal not malleable or ductile, not shiny and are poor conductors of thermal energy and electric currents
properties of metals shiny, ductile, good conductors of electric currents, malleable, and good conductors of thermal energy
properties of metalloids shiny, brittle, & good conductor of electric currents
a horizontal row of elements in the periodic table period
a vertical column of elements in the periodic table; elements in a group share chemical properties group
how did Mendeleev develop the first periodic table? by listing the elements in order of increasing atomic mass
properties of what repeat in a regular, or periodic pattern properties of elements
why are alkali metals more reactive than transition metals it is easier for alkali metals to loose their outer shell of electrons than for transition metals
the hardest material known Diamond
formed from burning oil, coal, and wood and is used as a pigment in paints and crayons Soot
why are noble gases unreactive they have a full set of valence electrons
which are the most reactive metals alkali metals
which metals are less reactive than alkali alkaline-earth metals
which metals include most of the well known metals transition metals
what force pulls objects together such as the sun, earth; cars gravitational force
what force holds electrons around the nucleus electromagnetic force
what is the force that makes protons push away form one another strong force
what force is important in radioactive elements the weak force
a subatomic particle that has a negative charge electron
an atom that has the same # of protons as other atoms of the same element but has a different # of neutrons isotope
radioactive weak force
the joining of atoms to form new substances chemical bonds
atoms strive to achieve a full set of valence electrons(8 valence electrons) octet rule
metals will lose electrons true
nonmetals will gain electrons true
what will decide whether or not to bond valence electrons
a solid that is produced as a chemical reaction precipitate
what is the most important sign of a chemical reaction taking place the formation of substances that have different properties
if molecules bump into each-other with enough force, what will happen the chemical bonds will break
what is the process by which substances change to produce new substances with new chemical and physical properties a chemical reaction
what do particles do in a solid they vibrate in place
what has fast moving particles a gas
what happens to the particles in an object at higher temperatures they move faster
why can balloons be twisted into different shapes because the particles of gas can be compressed
what happens to the particles of gas when a liquid becomes a gas they break away from each other
according to Charles' law, crushing a closed container of gas will make what happen the pressure will increase
if you open a bottle of perfume, after a while the smell will get to the other side of the room. what property is this sublimation
the melting point of salt is the same as its what freezing point
the point at which a liquid becomes a gas vapor point
how would you describe the nucleus dense and positively charged
when was Dalton's theory changed 1800's
all isotopes have the same number of what protons
what physical property are most metals at room temperature solid
how did Mendeleev arrange the elements on the periodic table by increasing atomic mass
mercury is the only transition metal that is not what at room temperature solid
what did Thompson discover that are negatively charged particles electrons
Created by: scottied
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