a vertical column in the periodic table is called a ___________.
group
Which of the following elements is NOT incuded in one of the representative groups?
Silver
boron
sodium
phosphorus
the atomic number of an element specifically tells you how many ________ are found in that element.
protons
Elements in group 13 have _____ valence electrons.
3
elements that are good conductors of heat and electric current
metals
Elements that have the same number of valence electrons are __________________.
in the same period
in the same group
called noble gases
called transition metals
______________ are found to the right of the stairstep.
Non-metals
Be sure to know how to label alkali metals, alkaline earth metals, transition metals, halogens, noble gases, lanthanides, and actinides on a blank periodic table :)
OK Mrs. Maier! ;)
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The atomic number of oxygen is __________.
9
8
16
15.999
An element is a substance that ______________________________________.
cannot be broken down into simpler substances.
Term for a row in the periodic table
period
elements that are poor conductors of heat and electric current
nonmetals
Germanium (Ge) is found in group ________ and in the ________ period.
14th group, 4th period.
In the modern periodic table, elements are arranged by increasing ____________________.
atomic number
Halogens are very reactive with most ___________.
metals
Term for an electron that is in the highest occupied energy level of an atom; e.g. outermost electrons.
valence electron
Elements in the same group of the periodic table have the same number of ________________
valence electrons
All atoms of the same element have the same number of _______, but can have different numbers of ________.
protons, neutrons
Mendeleev arranged that elements in his periodic table in order of __________
atomic mass (Mass)
Which of the following pairs is unrelated?
Gold - Transition Metal
Boron - Metalloid
Fluorine - Halogen
Hydrogen - Alkali Metal
___________ is an example of a non-metal.
krypton
all of these
oxygen
helium
Transition metals (aka transition elements) are found in _______________ of the periodic table
groups 3-12
noble gases are typically ________ because they have a full outer shell of _____________.
stable, valence electrons
Elements in group 18 (except for Helium) have ______ valence electrons.
8
A horizontal row on the periodic table is called a _______________
period
The __________ are the _________ reactive of all the elements.
alkali metals, most
Most of the mass of an atom comes from __________________.
protons and neutrons
Which of the following elements is NOT a member of the boron group?
Silicon
Gallium
Aluminum
Boron
the mass number is _________________________________.
the total number of protons and neutrons in an atom.
Atoms in the same group have ___________ properties.
similar
The ________ of Arsenic is 74.9216
atomic weight/atomic mass
_____________ differ in the number of neutrons found in an atom of the same element.
Isotopes
Elements that form a bridge between elements on the left and right sides of the periodic table
transition elements
____________ are found to the left of the stair step
metals
Elements with properties that fall between those of metals and nonmetals.
metalloids
The pattern of repeating properties displayed by elements in the periodic table is called ___________.
periodic law
Defined as one twelfth the mass of a carbon-12 atom.
atomic mass unit (amu)
Carbon-12 and Carbon-14 would be considered as __________.
isotopes of carbon
________ is an example of an alkaline earth metal
scandium
potassium
titanium
calcium
Alkali metals are found in ______ of the periodic table
group 1 (minus hydrogen)
an arrangement of elements in columns, based on a set of properties that repeat from row to row
periodic table
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