7th Science: Practice Test
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Helium and neon are examples of _______.
nonmetals
________________ are light elements with a strong reaction to other elements they come into contact with.
Alkali metals
________ have a sour taste and corrode metal quickly.
Acids
Which scientist organized the known elements into the periodic table?
Dmitri Mendeleev
___________ are elements that do not join with other kinds of atoms easily.
Inert elements
A(n) _______ is a specific type of atom with unique properties.
element
Bases are made up of _______ ions, which are _______ charged molecules of hydrogen and oxygen.
hydroxide; negatively
____________ are metals that were first found in rocks and minerals and “prefer” to join with other elements.
Alkaline earth metals
____________ are elements found in their pure form that do not combine with other elements.
Noble gases
A change in color and the production of light are both often evidence of a _______ change. A change in size, shape, or solubility are examples of a _______ change.
chemical; physical
As the metals progress from left to right on the periodic table, they grow _____________ to other elements.
heavier and less reactive
Which of the following is a major group of elements?
all of these
A piece of wood has a mass of 5 grams and a volume of 5.88 cubic centimeters. What is the density of the wood?
0.85