questions and vocab.
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| most common substances in the universe are? | 1. Hydrogen 2. Helium 3. Oxygen 4. Carbon
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| 99% of the mass of a human body are made up of (3)` | 1. Oxygen 2. Carbon 3. Hydrogen
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| Most common elements in earths crust? | 1. Oxygen 2. Silicon 3. Aluminum 4. Iron
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| composition of air and their symbols | Nitrogen N2-Oxygen O2-Argon Ar- Carbon dioxide CO2
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| In order what is shown on an element key? | 1. atomic number 2. element symbol 3. Element name 4. atomic mass
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| a____ is involved in the transfer or sharing of electrons | valence electrons
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| a_______is a positevely cahrged particle in the nucleus | proton
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| an elements_______is its row in the periodic table | period
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| the central core of an atom is called its | nucleus
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| a______carries a negative electral charge, and is located outside an atoms central core | electron
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| Mendeleev was the first to arrrange the elements according to their _________ in the periodic table of elements | properties
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| Elements in a _______ or ________ of the periodic table have similar characteristics | family or group
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| a _____ is a particle in the nucleus that has no charge | neutron
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| Scientists use the __________to measure the mass of the particles within the atom | atomic mass unit
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| What did Dmitri Mendeleev reconize in 1869? | he reconized a hidden pattern within the elements
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| What is the atomic mass of an element? | all the isotoypes in the element
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| when do patterns appear in the periodc table of elements? | when arranged in increasing atomic mass
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| what does the word periodic mean? | regular repeated pattern
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| what are the three basic parts of an atom | protons, neutrons and electrons
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| what does the nucleus contain? | protons and neutrons
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| e- | electron
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| p | proton
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| n | neutron
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| anything that has weight and takes up space | matter
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| a basic substance | element
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| the "building blocks" of matter | atoms
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| particles inside the nucleus | protons ans neutrons
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| the number of protons in a nucleus | atomic number
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| terms that refer to the elements in a column of the periodic table | family and group
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| elements in each group have | similiar characteristics
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| an atom is made up of smaller particles called | subatomic particles
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| what do we call the smallest unit of an element? | an atom
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| What are electrons? | tiny subatomic particles that swarm around the atoms nucleus
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| what does subatomic mean? | smaller than an atom
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| what kind of electrical Charge do electrons have? | negative
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| what kind of electrical charge do neutrons have? | none
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| what is a molecule? | two or more atoms bound together
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| what is the periodic table? | a table defining all elements
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| the word atom comes from an ancient greek word meaning | tiny
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| where can you find the electrons in an atom? | swarming around the nucleus in distinct orbits called shells
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| about how big is an atom? | one ten-millionth of a millimeter
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| how are elctrons arranged in an atom? | in energy levels
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| where is most of the atoms mass? | In the nucleus
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| which scientist is credited with discovering the atom? | j.j. thompson
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