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100
What is an element?
a pure substance that cannot be broken down
100
Where can you find all of the elements together?
periodic table
100
What is the center of an atom called?
nucleus
100
What is an ion?
an atom that has gained or lost an electron
100
What is an atom?
the building blocks of matter
200
How does a covalent bond form?
electrons are shared
200
How does an ionic bond form?
it is a bond formed between ions when electrons are transferred
200
What is the area on an enzyme where a substrate binds?
the active site
200
What are Van der Waals forces?
attraction between molecules
200
What is activation energy?
the energy needed to initiate a reaction
300
What is a chemical formula?
a combination of chemical symbols that shows the numbers of atoms of each element
300
What is an isotope?
atoms of the same element that differ in the numbers of neutrons
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What type of bond is formed when electrons are shared?
covalent bond
300
What is a catalyst?
a molecule that lowers the activation energy
300
How many electrons are found in the first energy level?
2
400
What is the positively charged particle around the nucleus?
proton
400
What is the negatively charged particle around the nucleus?
electron
400
What is the particle around the nucleus that has a neutral charge?
neutron
400
What particle is involved in forming bonds?
the electron
500
If an atom has 7 electrons, how many are in the second energy level?
5
500
An ionic bond forms between what types of elements?
a nonmetal and a metal
500
What types of elements do covalent bonds form between?
a nonmetal and a nonmetal
500
How can you tell where the metals and nonmetals are on the periodic table?
the thick line separates them.
500
What type of bond forms between Zr and Kr?
an ionic bond