Flash Cards

Science Unit Test 1 Study Stack

Question Answer
Which characteristics describe most nonmetals in the solid phase? Brittle, cannot change shape without breaking, lack metallic luster
What is an isotope? An element with a different number of neutrons than the periodic table suggests
In the isotope chlorine-35 what does the 35 refer to? The atomic mass
What is an element? Matter made up of one kind of atom
What are electrons? Negatively charged particles
What are protons? Positively charged particles
What is a neutron? A particle with no charge
Where are protons located? In the nucleus of atoms
Where are electrons located? Floating around the nucleus
Where are neutrons located? In the nucleus
Where is almost all the weight of an atom located? In the nucleus of an atom
What is an atomic number? The number of protons an atom has
What is atomic mass? # of protons + # of neutrons – weight of element
What are periods? Groups in the periodic table going horizontally
What do all elements in a period have in common? The same number energy levels
What are groups? Columns in the periodic table
What do all elements in groups have in common? Have similar properties and form similar bonds- same number of valence electrons
Metals that are malleable are… Easily bent and formed into lots of shapes
Metals that are ductile are… Drawn out into wires without breaking
Nonmetals are usually what at room temperature Gases
What state do all metalloids come in? Solids
Where are metalloids found on the periodic table? In between the metals and the nonmetals
What is a substance? Matter that has the same composition and properties all throughout- Elements are substances
What are molecules? Two or more atoms that are chemically joined together
What are compounds? A molecule with two or more elements
What is a mixture? When two or more elements come together but don't combine to make a new substance
What are two types of mixtures? Heterogeneous- The same throughout
Homogeneous- Different throughout
What are valence electrons? Electrons on the outer shell of elements
Ionic bonding occurs between what kinds of elements Between metals and nonmetals
Covalent bonding occurs between what kinds of elements Between two nonmetals
What are ions? When an atom loses or gains an electron
-When it loses an electron it is a positive ion and when it gains one it is a negative ion
How many valence electrons does an atom need to be satisfied? 8 to form an octet
In ionic bonding, electrons are transferred but in covalent bonding they are… Shared
How many electrons can each shell hold? First shell- two electrons
Second shell- 8 electrons
Third shell- 18 electrons
Fourth shell- 32 electrons
Fifth shell– 50 electrons
Sixth shell- 72 electrons

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