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Ch.7.1-7.4 Atoms & Periodic Table of Elements Flashcards | StudBud
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Ch.7.1-7.4 Atoms & Periodic Table of Elements
Ch.7.1-7.4 Atoms & Periodic Table of Elements
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atoms elements periodic table
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1
The atomic number of an element is based on the
mass of its nucleus.
number of electrons around its core.
number of neutrons in its nucleus.
number of protons in its nucleus.
2
Mendeleev created the first periodic table by arranging the elements in order of
decreasing atomic mass.
increasing atomic mass.
increasing melting points and densities.
increasing atomic number.
3
In Ernest Rutherford's gold foil experiment, resulted in him to infer
that electrons move in orbits around the nucleus of an atom.
that an atom consists of negative charges scattered in +
that electrons have almost no mass.
that an atom's positive charge must be clustered in center.
4
Fluorine, chlorine, bromine, and iodine are part of a family called
metalloids.
halogens.
alkali metals.
noble gases.
5
Which group contains the most elements?
metalloids
transition elements
metals
nonmetals
6
Which parts of the atom move around the nucleus?
protons
electrons
atomic mass units
neutrons
7
Which group of elements have some properties of metals and some properties of nonmetals?
noble gases
transition metals
halogens
metalloids
8
Which of the following groups contains an elements important to the chemistry of life?
metalloids
actinides
nonmetals
metals
9
A material is said to be ductile if it
is a mixture of a metal with at least one other element.
can be hammered or rolled into flat sheets and other shapes.
can transfer heat or electricity to another material.
can be pulled out, or drawn, into a long wire.
10
Which particles in atoms have a negative charge?
electrons
nuclei
neutrons
protons
11
What information in the periodic table indicates the # of protons in an atom?
the element's atomic mass
the element's chemical symbol
the element's atomic number
the position of element in its column
12
Which of these statements about a column of the periodic table is true?
The elements have the same atomic mass.
The elements have similar characteristics.
The elements have a wide range of characteristics.
The elements have the same atomic number.
13
At room temperature, more than half of the nonmetal elements are
alloys.
solids.
liquids.
gases.
14
The smallest particle that can still be considered an element is called a(n)
atom.
electron.
nucleus.
proton.
15
The elements that do not ordinarily form compounds are
halogens.
metals.
noble gases.
elements in the carbon family.
16
Which of these phrases best describes the general properties of metals?
not easily corroded
malleable, ductile, good conductors
highly reactive
dull and brittle
17
In an atom, the number of protons equals the number of
nuclei.
neutrons.
isotopes.
electrons.
18
The element Potassium has the atomic # 19 and mass of 39. How many neutrons in its nucleus?
19
20
58
39
19
From an element's location in the periodic table, you can predict
its properties.
its chemical name.
when it was discovered.
its chemical symbol.
20
Which group of metals are so reactive that they are never found in nature uncombined?
lantanides
alkali metals
transition metals
alkaline earth metals
