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Periodic Table of Elements
science study guide
Terms in this set (38)
how many elements are in each period?
what properties does a metalloid posses?
physical and chemical properties of both metals and nonmetals (metallic and nonmetallic)
how were elements arranged on Mendeleev's first periodic table?
by atomic mass
When Mendeleev developed the first periodic table, there were approximately ____ known elements.
what is meant by periodic in periodic table?
what three properties repeat in mendeleev's periodic table?
melting point/ boiling point/ reactivity
the place of an element in the modern periodic table is determined by its ______
what can be found on an element key?
atomic number/ chemical symbol/ atomic mass/ state of matter
the radius of a silicon (Si) atom is 110 pm. what is its circumference? (C= 2(3.14) r)
the radius of a sodium (Na) atom is 186 pm. what is the circumference? (C= 2(3.14) r)
what category of elements represents almost 3/4 of the periodic table?
which element have properties of both metals and nonmetals?
the elements in the second column from the left edge of the periodic table are the ________
alkaline earth metals
the large group of elements in the main part of the periodic table are the ___________
why do main-block transition metals, such as iron, make good building materials?
high densities/ great strength/ resistance to corrosion
what are some features of alkali metals such as lithium?
react quickly with other elements/ do not occur naturally/ soft/ silvery/ lowest density
what are properties of all metals?
shiny/ easily pulled into wires and rolled/ hammered into sheets/ good conductor of thermal energy and electricity/ high density/ high boiling and melting points/ most are solid
which two elements conduct electricity but is not a metal?
hydrogen and carbon
all metals conduct __________
electricity and thermal energy
At room temperature, most metals are
are most metals brittle?
what properties are common to alkaline earth metals?
react quickly/ soft/ silvery/ low densities but greater than alkali / do not occur naturally
what are 4 main elements in the human body?
oxygen/ carbon/ hydrogen/ nitrogen
the majority of the human body is made of which type of element?
what are a few characteristics of noble gases?
non-reactive/ valence shell of electrons is full/ stable/ do not form compounds
Helium and most nonmetals are found in which area of the periodic table?
a halogen is found in group __________
a halogen is an element that can react with a metal and form _________
Halogens are only found in nature as ___________
which element is the most common element in the universe?
which elements are located between the metals and nonmetals on the periodic table?
which of the following is the most abundant metalloid in the universe?
A metalloid acts as a conductor at _____
a metalloid acts as an insulator at ________
in which state are most nonmetals at room temperature?
All ____ except mercury are solids at room temperature.
do metals conduct heat well?
in the modern periodic table, elements are arranged according to increasing __________
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