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17 Cards in this Set
- Front
- Back
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Law of conservation of mass |
Matter can be neither created nor destroyed |
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Define an atom on the basis of Dalton's atomic theory |
An atom is the basic unit of an element that can enter into chemical combination |
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Give three basic examples of subatomic particles |
Electrons protons and neutrons |
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What is radiation |
Radiation is the emission and transmission of energy through space in the form of waves |
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What are electrons |
Negatively charged subatomic particles |
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What is a coulomb |
A unit of electric charge |
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In comparison to protons and neutrons is an electrons Mass large or small |
The mass of an electron is exceedingly small |
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What is radioactivity |
The spontaneous emission of particles and or radiation |
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What must an atom do to maintain electric neutrality |
To maintain electric neutrality an atom must contain an equal number of positive and negative charges |
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The positively charged particles in the nucleus are called |
The positively charged particles in the nucleus are called protons |
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What is the dense central core within the atom called |
The dense central core within the atom is called a nucleus |
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True or false : each Proton carries the same quantity of charge as an electron and has a mass of about 1840 times the mass of an oppositely charged electron |
True |
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True or False: The mass of a nucleus constitutes most of the mass of the entire atom, but the nucleus occupies only about 1/10^13 of the volume of the atom. |
True. The mass of a nucleus constitutes most of the mass of the entire atom, but the nucleus occupies only about 1/10^13 of the volume of the atom. (Pg.48) |
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Define neutron. |
Neutrons are electrically neutral particles having a mass slightly greater than that of protons. Pg.49 |
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True or False: Only some atoms can be identified by the number of protons and neutrons they contain. |
False. All atoms can be identified by the number of protons and neutrons they contain Pg.49 |
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What is the atomic number (Z) ? |
The atomic number (Z) is the number of protons in the nucleus of each atom of an element. Pg.49 |
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In a ---------- atom the number of protons is equal to the number of electrons, so the atomic number also indicates the number of electrons present in the atom. |
In a neutral atom the number of protons is equal to the number of electrons, so the atomic number also indicates the number of electrons present in the atom. Pg.49 |
