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PScience Unit2test

Physical Science Unit 2 test -Connections Academy

The Greek Philsopher Democritus coined what word for a tiny piece of matter that cannot be divided ? atom
According to John Dalton's observations, when elements combine in a compound, the ratio of their masses is always the same.
J.J. Thomson's experiments provided evidence that an atom contains negatively charged particles.
Which statement best describes Rutherford's model of the atom? It is a like a huge stadium with a positively charged marble at the center.
The elements most likely to form more than one type of ion are the transition metals.
The name Iron (II) indicates that a coumpound contains iron ions with a 2+ charge.
Alkali metals, alkaline earth metals, and aluminum all form ions with positive charges equal to the group number.
In the name carbon dioxide, the prefix of the 2nd word indicates that a molecule of carbon dioxide contains two oxygen atoms.
Which subatomic particle has a negative charge? electron
The number of protons in one atom of a element is the element's atomic number
Which statement about subatomic particles is NOT true? Protons and neutons have the same charge.
How many neutrons are in the isotope carbon-14? 8
In Niels Bohr's model of the atom, electrons move like planets orbiting the sun.
Which statement about electrons and atomic orbitals is NOT TRUE? An electron has the same amount of energy in all orbitals.
The glowing of a neon light is caused by electrons emitting energy as they move from higher to lower energy levels.
What do scientists use to predit the locations of electrons in atoms? probability
Which of the following most accurately represents John Dalton's model of the atom? a tiny, solid sphere with a predictable mas for a given element
To find the number of neutrons in a atom, you would subtract atomic number from mass number
How was Bohr's atomic model similar to Rutherford's model? It described a nucleus surrounded by a large volume of space.
In a periodic table, a set of properties repeats from row to row.
The results of Rutherford's gold foil experiment demonstrated that the ____________occupies a very small amount of the total space inside an atom. nucleus
If element Q has 11 protons, its atomic ____________is 11. number
The region in which an electron is most likely to be found is called a (an) orbital or energy level
An atom in which an electron has moved to a higher energy level is in a ____________state. excited
When Mendeleev organized elements in his periodic table in order of increasing mass, elements with similar properties were in the same ____________. group
Mendeleev's periodic table was useful because it enabled scientists to predict properties of unknown _______________. elements
Moving from left to right across a row of the periodic table, which of the following values increases by exactly one from element to element? atomic number
The atomic mass of an element is a weighted average of the masses of an element's isotopes.
Which general statement does NOT APPLY to metals? Most metals are brittle.
Group 7A of the periodic table contains the most reactive nonmetals.
The unit for atomic mass is amu.
As you move from left to right across a period, the number of valance electrons increases.
Compared with Group 2A elements, Group 6A elements have more valance electrons
Typically, atoms gain or lose eletrons to achieve a stable electron configuratiion.
The formation of an ionic bond involves transfer of electrons.
In the compound, MgCl2, the subscript 2 indicates that there are 2 chloride ions for each magnesium ion.
Which of the following is a typical property of an ionic compound? tendency to shatter when struck.
The tendency of an element to react is closely related to the number of valence electrons in atoms of the element.
Amoung the alkali metals, the tendency to react with other substances increases from top to bottom within the group.
Which of the following groups contain 3 elements with stable electron configurations? helium,xenon, neon
The formation of an ionic bond involves the transfer of electrons.
Which type of bond is held together by the attractions between the protons in the nucleus and the shared electrons? convalent bond
In a polar convalent bond, electrons are not shared equally between atoms.
Because water molecules are polar, and carbon dioxide molecules are nonpolar, water has a higher boiling point than carbon dioxide does.
The pattern of repeating properties of elements revealed in the periodic table is known as the periodic law
To determine the atomic mass of an element, you would take a _______________ average of the isotopes that make up the element. weighted
Created by: weezahiott