how does nuclear fusion create new elements inside stars

small nuclei combine, then form large nuclei

unhealthy human cells are destroyed

a material is said to be ductile if it

can be pulled out, or drawn, into a long wire

what prediction did Mendeleev make that came true less than 20 years later?

said 3 new elements would be discovered & described prop

which of the following statements about transition metals is true?

include familiar metals such as gold,silver,copper, & nickel

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Atoms and Periodic Table End of the Year Review 2

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Atoms and periodic table review # physical science

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Questions 21

Answers

1
how does nuclear fusion create new elements inside stars
large nuclei combine, then form smaller nuclei
small nuclei combine, then form large nuclei
all the nuclei repel each other because of positive charges
small nuclei cause large nuclei to break apart
2
which group contains the most elements?
metalloids
metals
transition elements
nonmetals
3
in radiation therapy
isotopes are traced through a chemical reaction
radioactive isotopes are used as fuel
weak spots in water pipes are found
unhealthy human cells are destroyed
4
what information in the periodic table indicates the number of protons in an atom?
position of the element in its column
element's atomic number
element's chemical symbol
element's atomic mass
5
the reason radioactive isotopes can be followed in a chemical reaction is that they are
do not decay
do not react chemically as nonradioactive isotopes do
give off radiation
are stable
6
a material is said to be ductile if it
can be pulled out, or drawn, into a long wire
can be hammered or rolled into flat sheets and other shapes
is a mixture of a metal with at least one other element
can transfer heat or electricity to another material
7
which property of bromine could you NOT predict based onit being nonmetal in the halogen family
poor conductor of heat
poor conductor of electricity
highly reactive
liquid at room temperature
8
the elements in a column of the periodic table
have the same atomic mass
are in the same period
have very similar chemical symbols
have similar properties
9
the two most common alkaline earth metals are
copper and zinc
iron and silver
sodium and potassium
calcium and magnesium
10
the sun is made up mostly of
iron
carbon
beryllium
hydrogen
11
in an atom, the number of protons equals the number of
electrons
isotopes
neutrons
nuclei
12
fluorine, chlorine,bromine, and iodine are part of a family called
alkali metals
metalloids
halogens
noble gases
13
the elements that do not ordinarily form compounds are
halogens
elements in the carbon family
metals
noble gases
14
radioactive isotopes are called________ can be used to detect some medical problems
gamma radiation
tracers
alpha particles
beta particles
15
during radioactive decay, atomic nuclei of unstable isotopes
are unchanged
give of nuclear radiation
form chemical bonds
are broken down by radioactive bacteria
16
what prediction did Mendeleev make that came true less than 20 years later?
said 3 new elements would be discovered & described prop
predicted the atomic numbers of unknown elements
said that the periodic table would be made into 18 families
predicted that a total of 112 elements would be discovered
17
which of the following statements about transition metals is true?
they are so soft that they can be cut with an ordinary knife
include familiar metals such as gold,silver,copper, & nickel
are the most reactive of all the types of metals
are never found uncombined in nature
18
which groups of elements shares characteristics with both metals and nonmetals
lanthanides
salts
halogens
metalloids
19
in 1896, the french scientist Henri Becquerel discovered
light emitting polymers
radioactive decay
process to turn natural rubber into a stretchable polymer
how to make alloys
20
which particles in atoms have a negative electric charge?
electrons
proton
neutrons
nuclei
21
a piece of paper will provide protection from
gamma radiation
gamma rays
beta radiation
alpha radiation

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