What is the group/family name for column 2 (2A) of the periodic table?
alkaline earth metals
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25
The periodic trend that describes the relative size of the atom is ...
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10
What does the group/family that an element is in tell you about its atomic structure?
the number of valence electrons (electrons in the outermost energy level/shell)
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20
Atomic radius (increases or decreases) as you move down a group/family and (increases or decreases) as you move across a period from left to right.
Atomic radius INCREASES as you move down a group/family and DECREASES as you move across a period from left to right.
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25
Why does the atomic size decrease as you move across a period from left to right?
the increasing number of protons causes a greater electromagnetic attraction between the protons & electrons, pulling the electrons closer to the nucleus
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10
What are valence electrons?
electrons in the outermost energy level/shell
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25
Why do electronegativity and ionization energy increase as you move across a period from left to right?
the increasing number of protons causes a greater electromagnetic attraction between the protons & electrons, making it more difficult to remove electrons
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5
How many valence electrons does an oxygen atom have?
6
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Metals tend to (gain or lose) electrons to obtain a full set of valence electrons and become stable.
lose
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25
The periodic trend that describes the strength of the electromagnetic attraction between protons and electrons within the atom is...
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5
How many energy levels does an aluminum atom have?
3
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The periodic trend that describes the amount of energy required to remove an electron from an atom is ...
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eraser
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gift
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Which element is larger magnesium or calcium? why?
