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20 Cards in this Set
- Front
- Back
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What is the primary factor in determining an atoms stability?a. neutron to proton ratio,b. neutron to electron ratio,c. alpha particle to beta particle ratio, d. proton to electron ratio
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d. proton to electron ratio Yhe neutron to proton ratio detemines the stability of an atom
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What is the charge of an alpha particle? a. 1+ b. 0 c. 1- d. 2+
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answer d 2+ A helium nucleus has two protons and two neutrons , thus , the resulting charge on this particle is 2+
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What is the negatively charged particle in anatom?
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electron
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How many protons are present in an atom potassium? a. 19, b. 58, c. 20, d. 39
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19 All potassium atoms have 19 protons, so a potassium -39 isotope must have 20 neutrons.
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What is the name of the element that has the atomic number of 3?
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lithium
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How is the atomic mass unit defined? a. 1/14 the mass of nitrogen -14 atom. b. 1/13 the mass of carbon -13 atom, c. 1/16 the mass of -16 atom, d. 1/12 the mass of a carbon -12 atom.
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The amu is defined as 1/12 the mass of a carbon -12 atom.
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What is the charge of a gamma ray?a. 0, b. 1+, c. 1-, d. 2+
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a. 0 Gamma rays have no mass and carry no charge.
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What is the charge of a beta particle? a. 1+, b, 2+, c. 1-, d. 0
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c. 1- a beta particle is an electron that is ejected from a neucleus during the decay of a neutron. Electrons have a 1 (charge).
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Which of the following statements is correct: a. an electron is about 2000 times more massive than a proton, b. The nucleus is mostly empty space, c. A neutron will always be found orbiting the nucleus, d. A proton is about 2000 times more massive than an electron.
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d. Neutrons and protons are the massive particles of an atom. They are nearly 2000 times more massive than electrons.
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Which of the following is true for any atom? a. mass number+number of protons+number of electrons, b. atomic number+ number of neutrons +number of electrons, c. atomic number+ number of protons+number of electrons, d. mass number + number of protons + number of neutrons
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b. atomic number=number of protons=number of electrons
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What isotope has seven protons and six neutrons? a. nitrogen-13, b. carbon-7, c. nitrogen-7, d. carbon -13
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nitrogen-13
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WHICH SCIENTISTS DETERMINED THAT ALMOST ALL OF AN ATOM'S MASS IS LOCATED IN ITS NUCLEUS?
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Rutherford. Rutherford concluded from the gold-foil experiment that the atom was mostly empty space, and the nucleus was a small area at the center of the atom where the protons and neutrons , and most of the mass, were located.
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Which of the following particles has a mass that is almost the same as the mass of a proton? a. beta particle, b. positron, c, neutron, d. electron
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c. neutron
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What is the name for atoms of an element that have different masses? a. isomers, b. alloforms, c. isotopes, d. allotropes
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c. isotopes Isotopes have the same atomic number but different masses.
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The atomic number of an element is defined by it's number of_________. a nuclei,b. protons, c. electrons,d. neutrons
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b. protons The number of protons identifies an element and is the element's atomic number
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How do gamma rays differ from alpha particles and beta particles? a. Gamma rays and alpha particles result in the formation of new atoms, but beta particles do not. b. Alpha particles and beta particle emissions result in the formation of new atoms, whereas gamma ray emmissions do not. c. Gamma rays and beta particles result in the formation of new atoms, but alpha particles do not. d. Gamma rays have mass, whereas alpha and beta particles do not.
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b. Alpha particle and beta particle emission result in the formation of new atoms , whereas gamma ray emission do not.
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Whiich of the following statements concerning hydrogen is false? a. All hydrogen isotopes have one electron, b. Hydrogen's electron is not found in the nucleus, c, All hydrogen isotopes have one neutron, d. All hydrogen isotopes have one proton.
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a. All hydrogen isotopes have one neutron.
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What is the smallest particle of an element that maintains the properties of the element?
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atom
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What fundamental particle is identical to a beta particle?
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the electron
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An atom of an element contains eight electrons. What is the identity of this element? a. flourine, b. carbon, c. nitrogen, d. oxygen
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d. oxygen Because there are eight electrons in the atom, there must be eight protons present. Oxygen has eight protons.
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