A
anything that has mass and takes up space
Matter
important to build strong bones
Calcium
State whether or not the following elements would sink or float:
Aluminum (2.70 g/cm3)
Wood (0.85g/cm3)
Lead (11.30 g/cm3)
Sink
Float
Sink
Alkaline metals are ______ and ______ such as sodium and potassium.
light; explosive
elements that are considered malleable because they can be pounded and formed
Metals
the space surrounding an atomic nucleus where electrons orbit
electron cloud
the center of the atom where protons and neutrons are found
Nucleus
the lightest element; quite reactive
Hydrogen
Chemical formulas are made up of _____ and_____.
Letters and numbers
If an element is _______ it can be beaten and stretched into a long string.
ductile
Alkaline metals are ______ and ______ such as sodium and potassium.
light; explosive
the tiniest piece of matter that still contains all the properties of it
atom
the most abundant element on Earth
Oxygen
the lightest metal that is third most abundant on Earth
Aluminum
Metalloids are _________(can carry electricity) and include _____ elements and can be poisonous.
semiconductors ; seven
Substances that are denser than a fluid (water) will _____, while substances that are less dense will ______.
sink; float
rocks; fireworks
used in hot balloons and belongs to the noble gas family because it doesn’t react easily
Helium
A specific type of atom with unique properties
element
Ductile elements are also good ____ and ______ conductors.
heat; electricity
Can Mixtures be separated? Why or why not?
Mixtures can be separated because they are not chemically bonded and are just mixed.
is the result of two or more different elements that have chemically joined or combined
compound
**Name two of the seven Abundant Elements
hydrogen, helium, oxygen, silicon, aluminum, iron, or calcium
the number of protons found in an element
Atomic Number
____ Earth metals are rare and can be found in rocks and used for ________, giving off bright colors when they burn.
Alkaline; fireworks