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How many atoms make up a molecule of water?
3 - two hydrogen and one oxygen
What charge does a neutron have?
no charge - neutral
If atoms are mostly empty space, why can't I push my hand through my desk?
Atoms appear solid because of the rapid movement of the electrons.
What is an atoms mostly made up of?
empty space
What do we call the central core of an atom?
the nucleus
True or False? All substances are made from two or more elements.
False
An ______________ is a substance that can't be broken apart into other substances.
element
What are the tiny particles that make up an atom?
protons/electrons/neutrons
Identify THREE examples of properties.
color/hardness/density
Which one is not a molecule? O/O2/H2O/NaCl
O - because it is just one atom of oxygen - the others are 2 or 3 atoms combined
How many atoms must join together to form a molecule?
two or more
How can carbon make so many different things with different properties?
The answer lies in the way the atoms are arranged.
Identify the 4 forms of carbon.
coal/graphite/diamond/buckyball
What is the result of an atom always having an equal number of protons and electrons?
The atom has a neutral charge.
Carbon protons? Electrons? Neutrons?
6 protons/6 electrons/6, 7, or 8 neutrons
What makes up most of an atom’s mass?
the nucleus
Electrons charge? Mass? Location? Speed?
negative charge/small mass/travel rapidly around the nucleus
How is Schrodinger's theory different from the others?
His theory includes the electron clouds or orbitals.
Which scientist developed the most accurate theory of an atom?
Schrodinger
An/A ___________________ is the smallest particle of an element that still has the properties of that element.
atom
What two elements make salt?
sodium and chlorine
What element is diamond made of?
carbon
How can you prove that an element is truly an element (not a molecule)?
It can't be broken down into anything smaller.
Which one is an element? water/salt/sodium/H20
sodium
Fill in the blank: All matter is made up of _______________.
elements
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